New Era Stretch Mesh Cap. Adult sizes S/M (7 1/8-7 3/8), M/L(7 3/8-7 5/8), L/XL(7 5/8-7 7/8) 96/40 poly/spandex stretch mesh front panel and bill. (White hat is 100% cotton in front)100% polyester mid and back panels. Structured, Mid-profile, stretch fit.