Ergodyne - EGO12687 6632 Cooling Skull Cap is a low-profile cap that wicks away moisture when worn dry and provides evaporative cooling relief when worn wet. Stretchy, performance knit fabric uses UPF 50 plus sun protection to protect against harmful UV rays. Elastic band lines the interior for a snug, comfortable fit. Just soak this cap in water until saturated and then wring out excess water. Evaporative cooling process begins instantly and lasts for hours. When wearing dry, moisture-wicking fabric draws perspiration away to help keep you dry. Anti-odor treatment keeps this skull cap fresh. Reflective accents ensure workers are seen in low-light conditions. Low-profile design fits comfortably under a hard hat or helmet. Cap is great for construction, landscaping, roofing or working in the heat. It also reduces the risk of heat stress while mountain biking, motorcycling, gardening, hiking, playing sports and more.