The Endura Windchill Skullcap in Black is ergonomically designed to fit snugly under your helmet & keep your head warm from the wind & rain with the water repellent Teflon protective coating. Thermolite with High Performance Repel TEFLON fabric protector for ultimate weather comfort with durable water repellency Snug fitting for wearing under helmet Flatlock stitching for comfort Reflective flash & logo