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.
877776
Hard to answer. It is warm to the point I very seldom use the heat part and I am old and Thin. Best I can do.
1244871
I just used it (first day of summer) and felt it was perfect, but I get cold easily... Hope that helps.
1533098
That's what it says. I haven't used it in that cold of weather yet, but it does keep you warm around +30, that's as cold as I have had it
1358352
It is warm, but in between cotton and down. It breathes quite well, which is why it regulates temperature so well. They are thin, but heavy in weight. I like something a little heavier laying on me, so I know it's there, but I also don't like to be hot. I've had three of these over the last 20 years - they are great.
288964
No but it's made out of wetsuit material so it might keep you warmer in the water. Definitley not waterproof though.
405598
It provides a respectable amount of warmth for what it is (a rain jacket, not a coat). Throw on a couple layers under this jacket and you're good to go. I've worn this in non-rain, less than 40 degree (F) conditions and it's kept me warm with some layering.
1507050
I think it will keep you warm not sure about fit for physical activity though. The heat reflective technology is very effective.
66264
I am not sure. I always turn on my blanket to pre-warm my bed. I hate getting under cold sheets.
34933
No it won't keep you warm in cold water the fabric isn't that thick. It's better for sun protection.
897376
WARM. is the very lowest. I would surmize, it is a 'keep warm', and it is usually about 150 deg.then the control starts at 200, in 50 degree increments,max. of 400 degrees..hope this helps...
638050
I've never had this bag at -30 degrees, but I've had it at near 0 degrees. It is a comfortable bag, warm but do not layer up on your clothing. Because this bag is made to reflect body heat back inward. I am 5'8" and find this bag to be a little too roomy with too much air space inside. But you can pull the bag into you to eliminate the air space. All in all it is a good bag, but is made more for a person of 6' + the company would do well to make various sizes bags for various size people.
2211416
Not sure, but I have two of these and both work fine keeping a small area warm in cold weather.
394356
I haven't been in -30 to be able to test it out at -30 but... I have been in single digits with it and remained very warm and comfortable
31184
I really didn't notice a 'warming' sensation.,..but I did notice the thickness gave some cushioning on the bed, which was what I was looking for. I think it would be safe to say, it doesn't really keep you warm, more or less just comfortable
1345916
My first use of this bag was on a night that dipped to 40 degrees. If I completely covered myself (hood up and tight) I was actually a little too warm. My feet were chilly all night though regardless - wish I had worm wool socks that night.
880111
No. You would want to look for Heat Gear items (designed to keep you cool on the heat). This is a Cold Gear item (designed to keep you warm in the cold).