A snug skull cap made of our soft, midweight performance fabric. Best known for insulating under helmets and wicking sweat, it's a must-have in work, gym, and ski bags. Features moisture-wicking technology and low-profile design that fits comfortably under any helmet or hat for versatile year-round protection. SIZE: Adult snug fit, One SIZE fits most. Also fits Juniors and Teens; Dimensions - 7.5"(h) x 9.75"(w). Weight - 1.1 oz. BUILT FOR PERFORMANCE: Constructed with Comfort Shell Performance Fabric - 92% Polyester / 8% Spandex. Our proprietary performance technical fabric is the perfect blend of moisture management, odor-resistant and sun protection, blocking 97% of UV rays. It's engineered to support a demanding multi-season active lifestyle while also featuring a brushed inside for next-to-skin softness. NO OVERHEATING: The Brain Shroud easily wicks away sweat and moisture from your head, making it breathable and quick-drying – perfect for every inside or outdoor adventure. CLEANING MADE SIMPLE: Time for a wash? Just throw it in the wash on cold, tumble dry on low heat and it's ready for its next use. SKULL CAP OR HELMET LINER: A great option as a standalone cap, under a bike or ski helmet, extra coverage on the xc ski trails, cold weather runs or wherever your adventures take you.