The Carhartt Men's Base Force 100% Cotton Midweight Bottom is the ultimate cotton base layer. These 218 gsm/5.5oz 100% cotton long underwear with heathered waffle for year-round versatility. Do you work in an industry where synthetic longunderwear are prohibited? These cotton longjohns might be the ticket. FastDry technology wicks away sweat and Rugged Flex Technology designed for ease of movement will keep you focused when climbing or reaching need to be first on your mind. Smooth flatlock seams for ultimate comfort and brushed Y-split waistband elastic with concealed stitching and contoured front with fly supports and provides comfort where you need it.