The premium, 8-ounce, 100% cotton fabric in this new union suit provides total body warmth in one comfortable garment. Body heat is trapped inside while the rib-knit neck, sleeve and leg openings won't let warm air escape. Like all Carhartt thermals, the seams are flat-lock stitched for added durability and comfort, and the button front placket and buttoned back opening provide important flexibility. To make it even more worker-friendly, it has low shrinkage for a more consistent fit and a tagless neck label. This job-tested item is perfect for workers exposed to cold environments.