CARHARTT. K87CRH. MENS WORKWEAR POCKET T-SHIRT. CARBON. Long-lasting heavyweight 6.75-ounce 100 cotton jersey knit remains durable comfortable. Fiber Content All Colors 100 Cotton except Heather Grey 90 cotton 10 polyester Carbon Heather Barrel Heather Dark Cobalt Blue Heather 60 Cotton 40 Polyester. Rib-knit crewneck that holds its shape throughout the workday. Side-seamed construction minimizes twisting and maximizes comfort. Durable left-chest pocket with sewn-on Carhartt label keeps items close at hand. Tagless neck label that doesn t scratch so you can focus on your day.