Our BOLT Hard Hat Cooling Sweat Band is designed to be activated by water and uses microfiber technology to keep you cool on the jobsite. Run it under water or submerge it for 30 seconds for full absorption, then wring out excess water and repeat when dry. Once activated, it wicks away moisture and heat for up to 4 hours of cooling. Soft padding provides comfort, while attachment clips make removal easy. It is compatible with MILWAUKEE Hard Hats and is machine washable.