Offering a great balance of ventilation and sun protection, the ultralight Sun Runner Cap from Outdoor Research(TM) features a removable neck skirt and mesh side panels. . Lightweight SolarShield(TM) nylon fabric dries quickly. Fabric rated UPF 30+ sun protection. Coolmax(R) headband for comfort and moisture management. Mesh side panels and ventilation. Removable sun skirt snaps to bill and covers the side mesh for total protection. Adjustable back strap for a versatile fit. Neck skirt includes removable chin cord with cordlock.