Our most popular training hat, the Swift Cap has UPF 50+ sun protection on the crown of your head, and a full mesh liner for superior ventilation in warm weather. The shaped brim and nylon panels offer serious protection from the sun, and its low profile fits nicely under a helmet. Features Fabric Performance Water ResistantBreathable Design Features Dark Fabric Under BrimMesh PanelsQuick Release Buckle Back Specs PRODUCT :#243430 FABRIC :100% SupplexA(R) nylon, plain weave main shell 100% polyester, mesh lining and side panels WEIGHT :2.5 oz/71 g