Our best-selling on field cap is made with PULSE, a breathable, poly-stretch fabric with R-ACTIVE tech. Its designed to perform, and fits players at all levels of the game. SHAPE MidPro FABRIC PULSE Performance Poly-Stretch VISOR UForm SWEATBAND StayDri Performance Stretch FIT & SIZE R- FLEX Xs-Sm (6 5/8 - 7), Sm-Md (7 - 7 1/4), Lg-Xl (7 3/8 - 7 5/8).