This cap is constructed with a wool blend stretch fabric, combining modern materials with a traditional on-field look. R-FLEX sizing provides fit-versatility for all levels of play. SHAPE MidPro FABRIC Acrylic-Wool Blend VISOR Precurved SWEATBAND Comfort Stretch FIT & SIZE R-FLEX Xs-Sm (6 1/2 - 7) Sm-Md (7 - 7 1/4) Lg-Xl (7 3/8 - 7 5/8)