Description of Outdoor Research Sun Runner Cap This versatile hat has a removable, adjustable skirt that gives you shelter from harsh rays or can be removed when you just need ball-cap coverage. The lightweight fabric provides UPF 30+ sun protection. Mesh side panels let air flow over the sides of your head. Features: SolarShield™ construction Supplex® nylon fabric; UPF 30+ Plastic-stiffened bill TransAction™ headband for comfort and moisture management Mesh side panels aid ventilation Removable sun skirt snaps to bill and covers mesh for total protection External Cinch-Strap adjustability Removable chin cord with cordlock Avg. weight: 2.8 oz./79 g (size L)