Turtle Fur Comfort Shell UV Brain Shroud Lightweight Performance Helmet Liner Skull Cap 92% Polyester, 8% Spandex Imported Size: Adult, One Size fits most. Also fits Juniors and Teens Single-layer Comfort Shell Performance Fabric - 92% Polyester, 8% Spandex UPF 50+ Sun Protection - Blocks 97% of UV Rays Breathable and Quick Drying Beanie/Liner, Double-layered at ears Perfect for mountain biking, cycling, hiking, kayaking, climbing and many more outdoor adventures