The Under Armour StealthForm Uncrushable Hat deliver breathable comfort, lightweight coverage, and clean athletic styling for training, travel, and everyday wear. Washable, packable, uncrushable. It's the hat that bounces back when you ball it up. Engineered to fit like a hug for your head, wick sweat, and feel weightless when you're wearing it. Almost like you're not wearing anything at all. In the low-profile style you've been asking for. Anatomically molded seamless construction for the perfect, custom fit Material composition includes 91% Polyester/9% Elastane. Notable features include Unstructured design is washable & completely packable-it snaps right back into shape, no creases; Ultra lightweight & breathable with seamless comfort sweatband & cool-to-the-touch Iso-Chill interior; Molded details with laser perforations for added breathability.