Flexfit® Pro-Formance Fabric Cap. Flexfit® Pro-Formance Fabric Cap. PRO-FORMANCE® tech. 97% Polyester and 3% fabric with the look and feel of wool. Moisture-wicking capable, superior drying. Fitted cap: fits deeper on back of head. 6 panel, Mid-profile, 3½" crown. Fused hard buckram on front panel. Light weight fabric. Matching undervisor. Sizes: S/M, L/XL. Colors: White, Black, Dark Navy, Grey, Red, Royal, White/Royal (Discontinued. Limited Quantities) Sizes: S/M: (6 3/4"-7 1/4") L/XL: (7 1/8-7 5/8)