11% Wool 87% Acrylic 2% Spandex, Structured, Firm Front Panel, The Flexible Fit. 6-panel Flexible Fitted Cap; Seamed Front Panel with Full Buckram; 6 Sewn Eyelets; Pro Stitch on Crown; 6 Rows Stitching on Visor; Matching Color Undervisor; Matching Color Sweatband; U.S. Patent 6,347,410; Available in S/M (56cm -59cm/7 - 7 3/8 /22" -23.2") & L/XL (59cm - 62cm/7 3/8 - 7 3/4 /23.2" - 24.4")