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 MidProFABRIC Acrylic-Wool BlendVISOR PrecurvedSWEATBAND Comfort StretchFIT & SIZE R-FLEX Xs-Sm (6 1/2 – 7) Sm-Md (7 – 7 1/4) Lg-Xl (7 3/8 – 7 5/8)