MESH MEETS ITS MATCH. The Nike AeroBill Classic99 Hat combines stretchy, sweat-wicking fabric with breathable mesh panels to help keep you comfortable throughout every round. Benefits Nike AeroBill technology combines breathability with sweat-wicking comfort. Soft mesh panels enhance ventilation. Snapback closure lets you adjust the fit. Terry sweatband is soft and absorbent. Twill fabric with spandex stretches for comfort. Product Details Fabric (heather): Front panels and upper bill: 91% polyester/9% spandex. Back of front panel/mesh: 100% polyester. Underbill: 86% polyester/14% spandex. Fabric (solid): Body: 86% polyester/14% spandex. Back of front panel/mesh: 100% polyester. Hand wash Imported Style: AJ5451;Color: Black/Black/White; Size: ONE SIZE; Gender: Male