Ergodyne - EGO12604 Chill-Its 8937 Performance Cooling Baseball Hat provides immediate cooling relief when worn wet. Soak the interior in water until saturated, wring out excess water and wave to activate for immediate cooling that lasts for hours. When worn dry, evaporative cooling sweatband and lining wick sweat and moisture. Vented back panels increase airflow for breathable comfort. Anti-odor treatment allows fresh all-day wear. Black reflective logo and piping enhance visibility in low-light conditions while remaining low-profile for daytime wear. One size fits all. Height is 6-7/10". Brim is 7" wide. Hook-and-loop closure allows an adjustable fit. Use hat to reduce the risk of heat stress for outdoor recreational activities. It is ideal for construction, landscaping, roofing or anyone working in the heat.