Pretty warm. My issue is with the fit. Legs are long and a bit odd in the upper thigh area. The waist is high, but crotch long. So... I started the day with the Stoic lightweight merino base which worked well, but as the day progressed it got colder. I had carried these in my pack knowing the temps would get colder as we climbed to higher elevation. Switched to these. For the rest of the day, i dealt with the crotch being just a tad too long, leaving the thighs to rub together. It was very uncomfortable. I kept stopping , unclipping my pack and pulling the waist up but they kept doing it. Sizing down would have made the thighs too tight. Maybe i'm just too short for these and they'd work on someone taller.

Great addition to my base layer collection! Fits well, not too tight if you want to wear a layer underneath it too (I like lots of layers for resort snowboarding!).

Good midweight material on these for the colder days on the hill but these do run on the longer size. Recommend sizing down if you want these to be truly a next to skin layer.

I matched the size of these to the size of leggings/yoga pants, and they fit just right. The waistband is soft and comfortable and the material keeps me warm and dry. What more could one want?

I'm unsure of the sizing problems previously, but I gave my wife a pair of these baselayers for camping and skiing and she loves them. She says they're very warm and that they wick moisture well. They are definitely the correct size and seem "form fitting".

Bought these for my wife and they are too big on her. The fit is not unisex, definitely for men. She kept them as backups. They work fine but not great for layering.

It runs really large. I would at least size down and the fit is not as flattering as one would hope. I am returning this item

Okay the sizing is way off. I got XS for myself and Medium men's long underwear for my husband from this brand (similar concept both long leggings) but men's medium was smaller than women's XS. I don't why women's XS is so huge it's like they're not even trying to be close or true to size. Big disappointment!