Saucony Men's Windproof Boxer Brief Powerknit Lx: 87% Polyester, 13% Spandex, Flexshell: 100% Polyester and Waterproof Membrane Imported Compression fit delivers a locked-in feel that layers seamlessly under your favorite thermal tights or pants Windproof front panel protects you from the wind chill, while all over four-way stretch fabric wicks sweat and dries quickly, to keep you warm, dry, and comfortable Flat seams and double layer crotch gusset offer chafe-free support