Dri-FIT fabric. Seamless toe. Anatomically correct left and right foot. Reinforced heel and toe. Underwear is non-returnable. Washing Instructions Machine wash warm. Tumble dry low. Do not iron. Do not use softeners Dri-FITAnatomical fitReinforced heel and toe Fabric 70% Polyester, 26% Nylon, 4% Elastane |