Our best-selling on field cap is made with PULSE, a breathable, poly-stretch fabric with R-ACTIVE tech. It's designed to perform, and fits players at all levels of the game. FIT & SIZE R-FLEX XS-SM (6 5/8 - 7) SM-MD (7 - 7 1/4) LG-XL (7 3/8 - 7 5/8) Richardson PTS20