Description The Carhartt Menâs Classic Cotton-Poly Base Layer Union Suit is a cold-weather essential designed for warmth and comfort. Made with a cotton-poly blend, it reduces chafing, traps heat, and moves with you, making it the perfect base layer for long days in the cold.Product Description:5.29-ounce 60% cotton and 40% polyester blendWaffle knit construction traps heat for warmthRugged Flex stretch technology allows easy movementSmooth flatlock seams and tagless label for all-day comfortCarhartt logo printed on chestConcealed thumb loops for added coverage