Nike Unisex Feather Light Tennis Hat, Charcoal/Volt Made with ultra lightweight 100% polyester taffeta, this Cap also features 4 Dri-Fit mesh panels for maximum ventilation and sweat-sopping, quick-drying performance Adjustable VELCRO brand fastener at back Black underbill go reduce glare: Dri-FIT fabric to wick sweat away and help keep you dry and comfortable Mesh side panels for air flow Super lightweight, breathable design-perfect for any outdoor activity