2PCK-Miracool Hard Hat Pad - Cooling Lasts for Hours - Re-Usable - NAVY 2 PACK! 2PCK-Miracool Hard Hat Pad - Cooling Lasts for Hours - Re-Usable - NAVY MiraCool Hard Hat Pads are a simple and effective way to beat the heat. Simply hydrate in cool water and attach to your hart hat to feel instant cooling relief. 100% Cotton Fabric for comfort - Reusable Over & Over - Works without freezing or ice