82 Acrylic 15 Wool 3 Spandex, Structured, Firm Front Panel, Flexible Fit, Low-Fitting. 6 Panel Flexible Fitted Cap Seamed Front Panel with Full Buckram 6 Sewn Eyelets Pro Stitch on Crown 8 Rows Stitching on Visor Matching Color Undervisor Matching Color Sweatband. Enclosed back for a clean, sleek appearance OTTO FLEX Stretchable Sweatband - A snug, flexible fit with antibacterial, anti-odor and moisture wicking properties U.S. Patent 6,347,410 This Style Replaces 11-426, 11-427, 11-428