50% Cotton, 50% Polyester Imported Pull On closure Machine Wash Reliable Heat Retention: Made of cozy waffle-knit fabric, our thermal shirts for men trap and retain body heat; Ribbed cuffs help keep the cold out Soft Cotton Construction: Our men’s thermal long-sleeve shirt is constructed of a comfortable yet durable blend of 50% cotton and 50% polyester Comfort-Driven Design: Our men’s thermal shirt features a tagless label; Machine-washable long-sleeve shirt won't shrink excessively after washing Combats Cold Conditions: Our long-sleeve thermals for men help you weather extremely cold conditions during medium-level activities like hiking, camping, and even lounging