MiraCool Deluxe Hard Hat Pat w/Neck Shade Part No. 969 This MiraCool pad artificially influences your body temperature by cooling your head and neck. It will no longer be necessary to put a cold pop can on the back of your neck! To use - soak in water for 10-20 minutes, and attach to your hard hat using the hook and loop straps provided. The crystals in the MiraCool absorb the coolness in minutes, and pass it onto you for hours. It contains no ice, and does not freeze. It is reusable thousands of times. This cooling pad does not interfere with safety standards.