Review: Siliskin Protector for Glass Baby Bottles

Glass baby bottles are the way to go, and now a new bottle cover, Siliskin by Silikids, gives plastic users one less excuse. It’s like a big, thick silicone condom that protects your bottle when it goes places it shouldn’t and does things you don’t expect.

Photo of a 4 and 8 ounce Evenflo bottle wrapped in a Siliskin silicone wrapper.

Photo of an 8 ounce Siliskin standing upright without a bottle inside.

Why glass bottles? I strive to review products I can recommend, and I cannot recommend plastic bottles… if not for their potential health risks, then for their toxic afterlife. Some plastic bottles are now being made without bisphenol-A, but why bother navigating that maze when time-tested healthy and environmentally friendly glass exists?

My daughter was fed exclusively by me from Evenflo glass bottles, or direct from her mother’s tap. Glass is safe, washes and freezes well (haven’t had one crack anyhow) and is eminently reusable – plastic wears quickly with scrapes and repeated washings. If you don’t resell your glass bottles after your last child, they are easily recycled.

What is Siliskin? It’s a protective silicone sheath you place on your 4 oz. (120 ml) or 8 oz. (240 ml) Evenflo glass bottles.  Think of them as thick flexible condoms, but in fashion colors. The Big Idea is that its silicone skin will help reduce the chance of the bottle chipping or breaking when dropped.

What’s cool about Siliskin?

  1. It puts your breakage fears at ease.
  2. If a bottle breaks, glass shards are likely to be partially contained inside the silicone wrapper—and maybe the wrapper prevents breakage in the first place.
  3. It’s reassuring when an older child is helping feed your baby. I’ll be glad to hand my almost-4-year-old daughter a Siliskin-protected bottle when she learns to help feed her baby brother in a few months.
  4. The wrapper fits Evenflo bottles and one bottle is included with your purchase. That’s crucial because Evenflo is one of maybe a handful of companies offering glass bottles today in America, and yet the bottles are reasonably priced. (I’d love to hear from international readers about whether glass is more common in your country.)
  5. The silicone material is already a good gripping surface, but there are also nubbins placed around the bottle. Also, several circles are cut into the sheath to let you peek at the milk level.
  6. Siliskins are dishwasher safe.
  7. The product colors are soothing, not blinding. Curses upon the Baby Product Cabal that decided everything for babies must be in primary colors. The Siliskin colors vary between the 4 and 8 ounce bottles, coming in sedate aqua, lime, purple, pink or white.

Photo of an Evenflo cap and insert, plus an insert that is broken in two pieces.

Drop Test! I knocked a Siliskin-protected 8 oz. bottle off our 29″ tall dinner table onto hard laminate flooring and off our 36″ tall kitchen counter onto linoleum, twice each — once empty and once full of water.

The bottle never broke, but on the last test, with water, hitting hard laminate flooring, the bottle hit cap-first…. and a piece of the cap broke, gushing water onto the floor.

If I had been using a nipple or the cap cover, nothing is likely to have broken. I would normally only be using the round cap piece in question when storing milk in the refrigerator. I consider this breakage a fluke, not likely to happen very often, unless you’re a proficient bottle dropper when opening your fridge.

The Siliskin performed as advertised. Your mileage may vary of course, but I trust the thick Evenflo bottles a long way even without a wrapper.

What about bottle warmers? Glass bottles are not recommended for bottle warmers because the glass can quickly overheat. But here’s a dirty little secret: A hungry baby will drink warm or cold. You don’t need a warmer.

Siliskins are marketed as being microwave safe, but here’s a tip from the US Food and Drug Administration: “Heating breast milk or infant formula in the microwave is not recommended. Studies have shown that microwaves heat baby’s milk and food unevenly. This results in ‘hot spots’ that can scald a baby’s mouth and throat.”

Photo of the three-step instructions that come with the Siliskin.

How do you put the Siliskin on? The instructions shown above come attached to the enclosed bottle. You peel the Siliskin outward and roll it down halfway upon itself. Then you slide the bottle inside the skin and roll up the skin. Step-by-step photos can be found at the end of this article.

The application process can be annoying the first few times you do it. I’d like to see the wrapper’s design modified to eliminate an inward slope at the top of the wrapper (a slope that matches the bottle’s contour). The slope makes the hole where you insert the bottle smaller than the bottle’s circumference. That’s why you must peel the skin back to insert the bottle.

Competition? Not really! The only Siliskin competitor I’ve seen is the Wee Go by Babylife. I was duly impressed with it, until I saw Siliskin. As of this writing, Wee Go is only sold in what I assume is an 8 oz. bottle (I didn’t find a size listed on the company’s website), and it apparently uses a proprietary glass bottle. The company states, “[...] they don’t fit well on other bottles.”

A six-pack of Evenflo bottles runs about $15, or $2.50 per bottle.

A single bottle with a Siliskin 4 oz. sheath is $10 while an 8 oz. is $12.

In other words, buy one Siliskin in each size, and a bunch of inexpensive plain Evenflo bottles. Save yourself gobs of money by using the Siliskin on whichever bottle is clean at the moment. It’s a no-brainer. I recommend Siliskin.

And now… a Siliskin being placed on an Evenflo 8 ounce glass bottle by my wife…

Eight photos of my wife's hands as she puts a Siliskin on an 8 ounce Evenflo glass bottle.

Truth be told, I don’t apply the Siliskin the official way shown in these photos. I finagle the bottle through the skin’s narrow hole, and then slide the skin on in a straight forward fashion.

See also: Z Recommends has a positive review of Siliskins.

[The Siliskin samples detailed on this page were provided by Silikids to Thingamababy for review.]


37 Responses to “Review: Siliskin Protector for Glass Baby Bottles”

  1. brettdl says:

    My kids were exclusively breast fed, no bottles. But is there a similar product for older kids? I’d love to get rid of the plastic bottles and those metal ones are darned expensive.

    December 3rd, 2007 at 5:44 am

  2. Much More Than A Mom/The Opinionated Parent says:

    I’m loving Siliskins too!

    December 3rd, 2007 at 7:41 am

  3. AJ says:

    Metal sippy cups will cost more, but last through more than one kid. My daughter uses two Kleen Kanteens, about $15 in local stores, about $18 online. I figure a 12 ounce metal cup will be usable for quite a while.

    But if you need a drinking glass for the dinner table, I use pimento jars. They are thick and cost less than $3 a piece. We’ve had quite a few knock-from-table incidents with no breakage.

    December 3rd, 2007 at 7:42 am

  4. Marianne O says:

    Interesting info on the choice of plastic vs. glass at :

    “Plastic containers are the best choice for storing breastmilk in the refrigerator as more of human milk’s leukocytes or white cells adhere to glass. If the milk is to be frozen, glass is the preferred choice as it is less porous and offers the best protection. Most of the leukocytes in human milk are killed with freezing anyway. For this reason, milk that can be used within 8 days of expression should be refrigerated rather than frozen, because the antimicrobial properties of human milk are better preserved with refrigeration.” (more info follows on the webpage).

    December 3rd, 2007 at 9:47 am

  5. AJ says:

    Marianne, that reference page links to a La Leche League page as confirmation, but the La Leche League page states:

    “Current research suggests that human milk can safely be stored in glass or plastic receptacles with no significant nutrient loss. The Breastfeeding Answer Book recommends glass, clear hard plastic (polycarbonate), and cloudy hard plastic (polypropylene), in that order, as storage containers for freezing milk.”

    So, I have to call shenanigans. Of course, after the article was written, polycarbonate was realized to be a type of plastic usually associated with bisphenol-A.

    December 3rd, 2007 at 10:09 am

  6. Julian says:

    So what about the drop test without the skin? Will the bottle break if unprotected?

    December 3rd, 2007 at 10:42 am

  7. Marianne O. says:

    Yikes! I’m so sorry. I should have followed the link to the original LLL article. Consider me well chastised.

    December 3rd, 2007 at 11:19 am

  8. Christy says:

    Rats! I guess someone else had my $1million idea first! Oh well. I am glad to know that something like that exists. I too am strongly convicted towards glass baby bottles. I am nervous because all of the toddler dishes and such at my in-laws’ house are plastic and I do not want to use plastic at all if I can help it. Just like I am particular about my laundry detergent. I use Charlie’s Soap because it leaves no residue and is environmentally friendly. My MIL used some kind of hypoallergenic detergent that leaves residue, if I ever have to wash diapers at her house, I am going to have to go home and wash them again. What a waste of water.

    December 4th, 2007 at 6:26 am

  9. Jennifer says:

    You addressed the issue of heating in a bottle warmer or microwave (which I would never do anyway) but what about heating the bottle in boiling water, will this be able to withstand stove top boiling? I’m going to assume yes, and probably not necessarily too much of an issue. As you mentioned, they will eat (drink) warm or even cold; but it’s still nice to know if it’s an option.

    December 4th, 2007 at 11:40 am

  10. Bill says:

    Hi, my wife recommended this site and I have enjoyed reading it. However, please be aware that you are contributing to the hype around Bisphenol A.

    There is zero conclusive evidence supporting its dangers and the website you reference,, is nothing but inflammatory and the articles have no documentation to support their claims. Finally, check out, it is a real world website that avoids the hype. My wife and I have two girls and we have microwaved bottles of milk for both of them. They are both fine and extremely healthy.

    There is so much to worry about with our kids and Bisphenol A is not one of them. Also, I have absolutely no vested interested in the plastics industry. I am just a Dad.

    December 6th, 2007 at 5:50 pm

  11. AJ says:

    Bill, skeptics say the same thing about global warming. If you feel the research out there is insufficient, go ahead and roll the dice with your kids. I prefer to heed the findings of researchers who say it’s bad news. Glass is safe, and so I recommend the undisputed safe choice.

    There is also no escaping the toxic effects of plastic on the environment. Any way you look at it, glass is the safer option today and for our children’s children’s children’s children’s grandchildren’s future. (In a perfect world, I suppose I wouldn’t even be talking about plastic toys on this blog, but few of us can afford wooden-everything. When it comes to things like baby bottles, glass is accessible and safe; an easy decision in my book.)

    December 6th, 2007 at 6:38 pm

  12. Bill says:

    Great point AJ and I do agree with you, glass is safe. Until you drop it or until your other little one hits the baby on the head with it. But then we have the little Siliskins to protect us.

    I am being over the top for a reason, the messaging around Bisphenol A is extreme. If that website doesn’t scare you, I don’t know what will. However, it is taken as truth and that is just wrong.

    Glass may be 100% safe in the microwave, but it does have its own hazards. Also, don’t get me started on wooden toys.

    December 7th, 2007 at 9:03 am

  13. AJ says:

    If the messaging around BPA is extreme, it’s because the data from research studies is extreme.

    As for your glass example, any object in your home could be used to hit a toddler, but you’ve singled out glass. It’s soooo not a concern of mine.

    To me, debating the legitimacy of the many BPA studies is about worthwhile as debating global warming. I prefer to focus on solutions, and glass is a time-tested ideal one.

    As for ACSH, I would never take seriously anything that organization has to say. Try peer-reviewed research journals.

    December 7th, 2007 at 9:08 am

  14. Bill says:

    The results would be extreme, if they were accurate.

    I agree with you that the debate should not be around BPA. But as a society, we should be very worried about how often we are told the sky is falling.

    Data needs to be accurate and results scientifically replicated. We can not just run crazy with one study, regardless of the subject, even if the results are negative.

    I may be incorrect, I believe that your posting, and supported BPA website link, plays into unecessary fears.

    As I said in my first comment, my wife and I really enjoy your blog. Your reviews are very entertaining.

    December 8th, 2007 at 12:41 pm

  15. AJ says:

    Bill, I don’t know where you got the idea that there’s only been one study of BPA. Your suggested reading is from an organization Wikipedia doesn’t provide a very convincing description for.

    Check out this:

    Or this:

    Or this:

    I could go on, and on, and on.

    You’ve previously said you have no vested interest in the plastics industry. If I may ask, what company do you work for?

    December 8th, 2007 at 1:43 pm

  16. Bill says:

    I work for Johnson & Johnson. Also, I would assume that since achs does taking industry funding that everything they say is tainted and can not be trusted.

    Hopefully, you would not assume the same for me, just because I work for a large multi-national company. If it helps, I drive a Prius, we recycle, compost all of our food waste, buy organic and pay the energy company extra to get our power from the wind.

    The basis of my argument is that the world has become filled with exclamation marks. The website you reference, supports this argument. Just look at the headers.

    When I referenced one study, it was one BPA study that started it all. One study showed that high levels of BPA in rodents had toxic effects. That is not news, it is common sense.

    Expert panels reviewed data and concluded that while BPA levels are detected in humans, they are not high enough to product toxic effects. This occured not only in the US, but Europe as well.

    Having BPA in humans is one thing, having it at toxic or harmful levels is another.

    My point is simple, when you make a claim, such as BPA is unsafe, you must be 100% right. There are no data to make that claim.

    December 8th, 2007 at 6:18 pm

  17. Alicia says:

    I really enjoy reading your blog. Thanks for all the hard work you do in providing parents with down-to-earth info on important parenting topics.

    Your Siliskin review was very helpful and I have to agree that it’s one of my favorite safer baby bottle options to date.

    The discussion you had with Bill reminds of how I felt when I first read about concerns surrounding BPA – I was absolutely incredulous. I’m not one to take whatever the government or media says at face value, so I dug in and waded through the research myself. In light of that research, I’ve chosen not to take any chances with my own children.

    All I can say is that new knowledge of anything and everything in life begins with small questions and eventually grows to a full investigation if needed. How did parents feel when they were first told that lead based paint was toxic, or that second-hand smoke is dangerous for children? I think the only difference today is that we live in an information age. Parents are making themselves aware of health issues long before the government is ready to take action.

    December 8th, 2007 at 7:20 pm

  18. AJ says:

    Bill, it’s on your last point that we completely disagree. I don’t believe there is a vast conspiracy on the part of researchers around the world to demonize BPA. Sometimes a spade is a spade. There’s zero question in my mind about BPA.

    And even if BPA was not an issue, plastic is still unquestionably bad for us because of its toxic afterlife. Until the day arrives when we can cart the world’s old plastic on a space barge to be crashed into the sun, I will recommend glass.

    December 8th, 2007 at 8:10 pm

  19. Chris says:

    There’s a use for condoms AFTER the baby is born?

    December 13th, 2007 at 10:54 am

  20. Julie says:

    I am breastfeeding, however I have started to pump and am using glass bottles. I know it was mentioned above that a hungry baby would drink warm or cold milk, but how could I go about warming a glass bottle?

    April 4th, 2008 at 10:59 am

  21. Kristen says:

    We would place a container with hot water in the sink and place the bottle inside the container. It takes a little while (5 10 minutes) depending on how warm you want the milk. If it was bedtime or naptime, I’d warm it a little longer. This method worked so well for us that we never needed to used a bottle warmer or were tempted to use the microwave. Good luck!

    April 8th, 2008 at 5:32 am

  22. Sheri says:

    I have been reading this blog and am very glad for the info on the siliskin – which I am going to buy, along with my glass bottles. My daughter has been drinking out of the Avent bottles, which was shown in one study to release the most bph out of the 5 brands that were tested (UGH!) There is article after article after article and news reports regarding the release of toxins from plastic containers. I can see how the guy from J & J wouldn’t want to believe any of this… it is one of the companies that refuses to eliminate known toxins from its containers… As for me, I have already dealt with having breast cancer and I will do everything in my power to prevent my kids from having a serious illness that could have (even if it is the smallest percentage) been prevented with a simple change of bottles, foods, lifestyle, etc.
    This is a good link, with alot of other links to news articles/scientific research articles:

    April 14th, 2008 at 9:11 pm

  23. taraden says:

    Wow.. this product looks pretty cool. Unfortunately my son is now 14 months and pretty soon he will be off the bottle (let’s hope!!).

    A product to definitely keep in mind!

    April 18th, 2008 at 7:47 am

  24. Juanita says:

    I love this idea! However I wish there was a way to purchase JUST the silicon cover. I have a load of glass bottles and don’t need another one. Even if it would only drop the price down a couple of bucks, I simply don’t need another bottle. I just ordered mine today and can’t wait to get it in! I wish the stores carried them!

    April 22nd, 2008 at 6:31 pm

  25. Lisa says:

    The comments defending bpa containing plastics reminds me of the arguments made in the 70′s about tobacco. “My mom, dad, so-and-so, smokes and has never been sick a day in their life”. For the person to say his children drank out of them and are fine isn’t something he can say definitely, either. When he stated we can’t say that bpa is 100% unsafe. He can’t say is children are 100% unaffected by the use of it. That is something that we don’t know.

    They do know there are links to illness and chemicals. Chemicals-bpa is found in the urine of all babies who drink from bottles containing it. There was a dateline episode on last week that did a study on two families. Both familes had many chemicals in their bodies. We all do.

    Those, who try to be cautious and eliminate as many possible causes of illness are smart because there is no harm in being too safe. The only harm is to the pocketbooks of those who have vested interest in chemical and pharmaceutical companies.

    In using the ACSH as a reference, one is showing where their concerns lie. The ACSH (American Council on Science and Health) is not a neutral scientific council. They receive more than 75 percent of their funding from the chemical and pharmaceutical industry. In doing so their findings cannot be taken seriously. They are biased against those who go against their funders. It’s like the tobacco companies council’s that they set up to say that smoking wasn’t dangerous.

    People that use the internet today, are not as easily fooled, as they once were. We know we can’t believe everything we read on the internet. We can look up the owner’s of the website and see who funds it. Many of the pro-plastic webistes that doubt bpa’s being unsafe are owned by plastic companies. Always check the bottome of a site to see who owns it, who runs it…do a search on them and see who they are, for yourself, before believing what you read.

    Glass bottles are hard to break. They were used for feeding babies for decades and their use only declined because plastic companies put out lots of advertising and people bought into them because they were new, decorative, etc. and didn’t think chemicals were being released into their bodies.

    One can say that the chemicals released into liquids in baby bottles are in safe amounts. In reality, no one knows, for sure, how much is really safe and if it could be a co-factor in many of the illness that have been on the rise since the use of plastic bottles began

    For me, my family, and everyone I talk to about this subject, we prefer to use something that will not increase the amount of chemicals in our bodies. We can’t eliminate all sources, but we can eliminate the ones we recognize.

    Sorry so long, my daughter is expecting my first grandchild and I’ll definitely be buying a couple of the siliskins for her to use with our evenflo bottles, some of which are 40 years old, they’ve been around as long as I have.

    April 25th, 2008 at 6:01 pm

  26. Sheri says:

    There have been a lot of updates on BPA in the news since my last posting. My question now is: How are you feeling about BPA now Bill? Are you happy that your children used plastic bottles? I don’t understand how the leaders of these companies can lay their heads down at night. I have found research on BPA leeching into bottles dating back to 2005, yet not one bottle maker was responsible enough or cared enough about their consumers to pull it from the shelves. Unbelievable.
    As for the lady that wrote about the tobacco industry – there was a just huge article in the Missoulian, I think on April 17 or 18 from a guy that worked for one of the tobacco companies to find a “safe” cigarette. He did, but the company (I believe it was Phillip Morris) fired him and told him they couldn’t have a safe cigarette because nobody would be addicted to it and their sales would drop. Then he had to find a way around the secrecy clause they had sworn him to to report it to the FBI. It is good reading. Especially for someone (Wakeup Bill) who thinks that their company would NEVER engage in such a tactic. I don’t put it past any of the big businesses… their bottom line is money – even at the cost of our childrens’ health.

    April 27th, 2008 at 3:59 am

  27. Felecia says:

    My posting is more a question than a comment. I like the bottle skin, but I am wondering does it possibly fit on Dr. Brown’s (DB’s) 7 oz glass bottles. My baby only uses DB’s due to the great benefit – she used to reflex and lose half of her formula in spit-up, but not since I have been using DB’s, so I am in the process of switching to their 7oz glass and would love to use the sleeve. Also, I am now understanding the glass bottles are not recommended for bottle warmers. So, what is a mother to do; you can’t warma the plastic, and now no warming the glass either? Cold milk is not at all appealing to a sleeping baby and she is too new to drink it cold. Any words of wisdom would be greatly welcomed. Thanks.

    April 29th, 2008 at 4:45 am

  28. melissa says:

    Does anyone know if these will fit Born-Free bottles? Or any product that will fit it?

    May 28th, 2008 at 7:38 pm

  29. Pippin says:

    My husband is a chemist for a chemical company. We use glass bottles exclusively.

    He has a friend who is a chemical engineer and worked previously at a plastics company. This guy has 4 grown (18 and up) daughters. He told my husband that he NEVER allowed his daughters to drink or eat out of anything plastic- and he worked for a plastics manufacturer.

    He told my husband that if the average person knew exactly what went into making plastic, then they would never buy it again.

    May 28th, 2008 at 8:01 pm

  30. Diane says:

    My children are all grown, and now we have grandchildren. I always used glass bottles with my own children, and i have never had one break. And my kids were tough on them.

    June 2nd, 2008 at 2:18 pm

  31. Heather says:

    I would also really like to know if these will fit the born free bottle or if anyone knows of something that will…. My son drinks from the evenflo bottles but sucks so hard that he flatens the nipples out and has trouble getting a goood flow (the next nipple level is too fast a flow for him. Anyone know of another nipple that fits the evenflo classic bottles that may work better?

    June 2nd, 2008 at 7:39 pm

  32. Dianne says:

    My grandson is not being breastfed and I am concerned about the carcenogens that are associated with plastic bottles so I decided to buy him some glass bottles. To my surprise, I was not able to find one in my small town (just under 10,000 people). I have been successful in finding them on the internet. This is probably a pretty good indicator that most people in this country still use plastic bottles!

    August 8th, 2008 at 8:01 pm

  33. KariLyn says:

    Medela just came out with an 8oz glass baby bottle. I’m so excited. I cant wait to try it.

    September 2nd, 2008 at 12:22 pm

  34. lina says:

    This is what i looking for for my 6 month baby. I am living in Surabaya, East Java, Indonesia.
    How could I get the Siliskin baby glass bottle. Please inform detail price, payment and delivery method.
    Appreciate if you could reply to my email address.
    Thank you.

    October 20th, 2008 at 1:58 am

  35. kim a says:

    I was wondering about the best place to purchase siliskin bottle covers from?

    October 20th, 2008 at 10:03 am

  36. leliana says:

    can u help me, how i can buy siliskin bottle? i’m on Surabaya Indonesia….
    thank you…

    October 21st, 2008 at 12:19 am

  37. Alina says:

    You can buy individual siliskins here:

    They fit Dr Brown’s Evenflo Medela and Born Free glass bottles.

    Hope that helps!

    March 6th, 2009 at 9:32 am