Many have asked us at the shows we do for a thermal version of our warm weather base layer. Our new thermal version is the ideal base layer for those cold days. Wicks moisture away from the body just as fast as our warm weather version and featuring a mock neck. The same Polyester composite as our warm weather except its woven very differently. A fleecy inside with a smooth outside makes this version super comfortable! Machine washable and made in the USA!!! Color black. Sizing as follows; Measured 1" under arm pits around chest. Small 36-39", Medium 40"-43, Large 44"-37",XL 48"-51", 2X 52"-55", 3X 56"-59"