Outdoor Research Men's Revel Convertible Cap 100% Nylon; 2.5-layer, 40D Pertex Shield DS stretch ripstop rain cover, AirVent Fabric: 100% polyester Imported Breathable, moisture wicking AirVent Fabric on crown Convertible sun and rain protection Seam-taped , waterproof, Pertex Shield rain cover Rain cover folds into brim pocket Shaped, plastic-stiffened bill