Is it keep me warm under zero?
81961
If you mean, will it keep you warm when the temperature is below freezing, the answer is yes. Wear them under your regular clothing and use appropriate cold weather gear when outdoors.
403914
No. I would recommend purchasing a heat pad or heat lamp depending on what you are trying to keep warm!
606611
Absolutely not!! It is a small personal heater to have to get you toasty in a cool room. But I obviously disagree with a few of the other answers.
66264
I am not sure. I always turn on my blanket to pre-warm my bed. I hate getting under cold sheets.
1175254
I use it in an air conditioned home so it's hard to say but I don't think it's too warm. My son has never felt hot while in it and that is using it with full pjs.
1875430
I live in Buffalo, NY and I fully intend to.. Plenty of warm. It is LIGHT, not thin. Light does not mean it will not keep you warm!
1507050
I think it will keep you warm not sure about fit for physical activity though. The heat reflective technology is very effective.
137767
I do Karate here so its the same... keep it short - NO. It won't keep you cool. Sorry to say, it feels good on your skin, it won't feel so good under such a heavy garment... Plus, it will ruin this shirt... Live with your sweat, make peace with it, love it :) No need for anything under your gi. If you do want something, get a sleeveless top, but this this, its not as tight as one expected. Its good for jogging out showing off your body. If you want to keep 10 degrees cooler take some ice cubes. or spray yourself with that ice cold spray for injuries. If you want to wick sweat better, look for outdoor/hiking tops, they tend to wick much better than UA. I also tried Columbia's COOL ZERO or whatever its called, wasn't tight enough. Go to the shop before you order online, you will get the feeling yourself... Hope it helps. Again, this is one awesome shirt to wear without anything above it. I forgot to mention - AVOID COTTON! Unless you want to be weight down by all your sweat which might make you feel a bit cooler - since you're wet.
679113
Yes! Absolutely. I would say you have coldness for about 6-8 hours. But this is a mini cooler and not very large. I would order this in the next size up unless you are using it for snacks or a preschooler.
1778065
it does seem warm, but not to a point of sweating - and I sweat excessively under mild conditions.
41961
It gets warm quickly. There's no insulation. I wore a padded bra under mine and vodka out of the freezer. I had to alter mine to fit the right way too though and was able to fit it that way.
608376
The layer inside is a little bit thick and that keep you warm! But be careful: if you are doing exercises outdoor in low temperature and you are sweaty, And you let your body cold because you done, you will feel freeze! So You have To be active everytime! And when The exercise is done put some jacket on ! Well! That is The way i use it!
45290
No, not too warm, wear it under in very cold weather; wear it under in cool weather, like layers.
1163715
It has high and low, and warm. It works to keep these temps steady, but you can't set it to a specific temperature.
199139
I don't remember the last time I used this for cold, but the thermal part works, so it would help. It's pretty small, overall, so I could count on it for a short time, but nothing too long.
1413383
Hey! I am one of those sleepers who hates getting hot...and I haven't noticed any change in feeling warmer using this pad.
20290
I find it as warm as a medium fill down parka, but not quite as warm as a really high fill sub arctic rated down parka. It serves me well pn MOST winter days, all but the most frigid (below zero )