Whoops, added the review to the wrong thing! Yes this one is a thermal, was a different "thermal" I got that was cotton. This one is bloody huge, if you normally take a large get a medium, and I shudder to think that someone out there would fit the XL!. I got a large and when I got it I was looking for the tent poles to go with it. It is however pretty warm as an underlayer, best worn under another thermal though as the weave, although thick, is very open and looses a bit of heat otherwise.