A Quick, Brief Sale: Order 4 Pairs, Get 1 Free (yes, even with the 20% BFCM discount).The best underwear is now made in America. Two main fibers make up the body of these briefs; Supima Extra Long Staple Cotton (E.L.S.) and MicroModal. Harvested in the American Southwest, Supima cotton is one of the finest cotton fibers around.