High-performance Flexfit Cool & Dry technology combines with extra-pliable Poly Block Mesh for a softer, more comfortable cap that wicks moisture, dries quickly and circulates air for coolness. 100% polyster. Structure : Structured. Profile : Mid. Hat Size : S/M - 6 3/4 - 7 1/4. L/XL : 7 1/8 - 7 5/8