This headband is crafted from UV-protective nylon jersey fabric with stretch Lycra for a feel-good fit. Built with quick-dry technology, it offers maximum comfort and ideal temperature regulation whether you're trekking through the mountains or skiing in the backcountry. Thin enough to fit under a bike helmet and snug enough to stay put on a long trail run, this headband is built to be a versatile go-to piece for a range of action sports. When the day calls for staying fresh and protected from the sun, choose the Astro Band for women.