The premium, 8-ounce, 100% cotton fabric in this 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.For over 115 years, Carhartt has manufactured premium workwear known for exceptional durability, comfort, quality of construction, and fit that you can feel in the fabrics and see in the performance.