This shirt is very warm.
This shirt is very warm. I wear a 3/4 sleeve undershirt underneath it and am very comfortable. It is not a bulky as a sweatshirt and is actually warmer.
I like it so much, that I ordered another one if a different color. I am also trying out some of Heat Holders' other items of clothing (socks, slippers, gloves and a lighter weight long sleeve top).