Protective clothing: Keep your crews protected and comfortable wearing a brand they trust, Carhartt FR. Carhartt’s FR Force® Cotton Hybrid Shirt is unlike anything in the market. Carhartt Force® fights odors and its FastDry® technology wicks away sweat for comfort. Its side-seamed construction minimizes twisting and has extended sleeve plackets with two-button adjustable cuffs. This is made of 6.75 ounce, FR jersey knit and is 100% cotton. Other features include FR melamine buttons throughout, triple-stitched main seams and two chest pockets with button closure. Meets the performance of NFPA 70E and is UL® Classified to NFPA 2112. United. We outwork them all.