One frustrating fact of cooling vests is that they tend to be bulky, clunky, heavy, and most announce their presence like a 6-pound cyst growing out of your neck. People don’t want to stare or ask questions… but then they stare and ask questions. Thermapparel is flipping the script and has designed a vest—the UnderCool—that is virtually completely hidden, weighs less than two pounds, and lasts longer than many of their larger, full-vest competitors. Now, to reach these impressive benchmarks there naturally is a bit of give and take in the design, but not as much as one would think.
The UnderCool is ultra lightweight and stretchy, think shear (and comfy) yoga pants, and comes in four sizes (S, M, L, XL), cinching at the abdomen with Velcro. Cooling comes from four phase change (PCM) cooling packs that are inserted into the back of the garment—there is no cooling on the chest. We expected this to be a noticeable negative, but in our testing we still felt refreshed. And a huge side benefit of no cooling packs on the chest: there are no cooling packs on the chest. Women (and men) of all chest sizes can wear this comfortably and stealthily. No lumps, no tell-tale signs of a vest sticking out of collars, no uncomfortable placement of the packs over a bosom. Because the vest uses PCM to cool, they can recharge quickly in a fridge or freezer, and the packs, while cold, are not too cold. The vest is can be worn over a light t-shirt or directly on the skin and, although I have no experience in this department, I suspect it feels a bit like wearing a well-fitted bra. You don’t really notice it.
We tested this vest both indoors and outdoors in a variety of conditions. On a moderately warm day with temps in the lower 80s, the vest lasted about an hour and a half during heavy exercise before its cooling power was fully exhausted (I’d guess an hour in hotter temps). Not world beating, but solid, especially considering its weight. In the high sun, I did miss somewhat the cooling on the chest that other vests offer. Indoors and under clothes was another story. The vest easily lasted a full two hours, close to 2.5. I wore it for an extra hour and it still didn’t feel “hot” or uncomfortable. This makes it ideal for wearing out to dinner, to a movie, to a parent-teacher conference, out gardening, to that neighborhood barbeque, or to that musical you don’t really want to see but your spouse is making you go. You name it. There are better options for max cooling during exercise, but to be able to wear this under a t-shirt at the gym in full stealth mode is invaluable.
Is the UnderCool a game changer? I’ll say for many MSers, yes. My only niggle is that the cooling packs are hard to insert, but that’s not a biggie because you can toss the entire vest into the freezer and it takes up no more room than a half gallon of ice cream. If you had an extra one, you could just rotate them throughout the day. Brilliant! (Of course if you are in the office, you’ll need to hit the restroom or close your office door to do the swap.) I’ve tested many vests and few stay in my rotation after my review is complete. This one is a definite keeper.
Cold Sensitivity: 4
Weight: 1 lb 11 oz
Vintage Wash Crew Under-Vest Tee
Most cooling vest manufacturers recommend a light shirt be worn under the vest to both prevent chaffing and to maintain vest cleanliness. Alas, many T-shirts are made of thick cotton and weigh 6 ounces or more. ActiveMSers has teamed with MStshirts.com to procure the ideal under-vest T-shirt. Weighing 3.7 ounces (fabric weight), this under-vest tee is among the lightest of any shirt available on the market and is perfectly suited to be worn under phase change cooling vests or on its own. Made of 100% ring spun combed breathable cotton, the tee comes in the unisex sizes of XS, S, M, L, XL, 2XL, 3XL,and has a well-loved look thanks to its garment wash treatment. Available in white, black, blue and red. Price: $12.
Members of ActiveMSers can save up to 20% on select cooling vests with reserved coupon codes. To get your discount, join today by signing upfor our newsletter. NOTE: ActiveMSers has negotiated these discounts and has no other affiliation with these companies and receives no compensation or commission of any kind. Vests were donated for testing purposes.