Button closure ULTIMATE COMFORT: We use flatlock seams for a perfect fit and great durability. This winter cap for men and women fits like a second skin! You won't even know it is there. ULTIMATE MOISTURE TRANSPORT: Made of a blend of polyester and spandex, the runners hat wicks away moisture to keep you cool and dry throughout your performance while an ergonomic fit ensures optimal comfort. REFLECTIVE LOGO: Your Skull Cap Helmet Liner comes with reflective accents to provide an added level of safety for low-light workouts. ONE SIZE FITS MOST: Perfect for both men and women. PERFECT SPORTS ACCESSORY: Wear your SLS3 Runners Beanie underneath your helmet on your motorcycle, bike, snowboard and skis. Or wear the cold weather running hat while running, working out or playing football. Our premium micro fleece performance fabric makes it perfect for men & women and you will LOVE it on these chilly morning runs. Running Beanie Skull Cap Helmet Liner | Thin Winter Runners Cycling Hat | Moisture Wicking Sports Performance Cap Men Women - BIDNVCO8D