Turtle Fur Comfort Shell UV Brain Shroud Lightweight Performance Helmet Liner Skull Cap Tech Fabric: Comfort Shell Size: Adult, One Size fits most. Also fits Juniors and Teens. Dimensions - 9.75"(width) x 8.5"(length). Weight - 2.4 oz. Comfort Shell Performance Fabric - 92% Polyester / 8% Spandex. Our propietary performance technical fabric is the perfect blend of moisture management, anti-microbial 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. Machine Wash Cold, Tumble Dry No Heat Breathable and Quick Drying Beanie/Liner, Double-layered at ears Perfect for biking, jogging, kayaking, hiking, camping and an active all-season lifestyle.