Under Armour Women's Accelerate Cap Shell: 84% Nylon/16% Elastane; Lining: 80% Nylon/20% Elastane Imported Lightweight, unstructured 5-panel silhouette with curved sides designed to handle top speed runs ArmourVent Technology delivers true breathability in a light, stretchy, durable, fast-drying fabric UPF 30+ protects your skin from the sun's harmful rays Sweat-resistant fabric doesn't show or stain