Nike Unisex Feather Light Adjustable Hat, Volt/Black, One Size (Adjustable) Dri-FIT fabric to wick sweat away and help keep you dry and comfortable Six-panel design with interior taping for durability and comfort Perforated insets for enhanced breathability Adjustable strap with VELCRO brand fastener at back for a snug, customized fit Fabric: Body: Dri-FIT 100% polyester. Lining: Dri-FIT 91% polyester/9% spandex.