Lightweight, absorbent, and moisture wicking, this clava helps prevent overheating when you're active in warm weather. Wear it as a head covering or around your neck. The unique cooling technology in the polyester/spandex fabric is activated by soaking the clava in water, wringing it out, and then pulling it on. It also offers UPF 35 sun protection. Eddie Bauer Trailcool UPF Cooling Clava - Black