Here is a simple, yet effective personal cooling insert for helmets, hardhats and caps. Just soak it in cool water, towel dry the fabric and place in helmet. No ice or refrigeration needed to get a refreshingly cool ring that fastens to hard hats and helmets to help keep the head cool. Works pretty good when placed in other hats and ball caps too! Makes a good cooling accessory when added to the cooling wrap power of the Polar Neck Wrap, cool Wrist Wraps or other Polar-Products personal cooling gear. Add one to your order! Every order ships with one free original cooling tie - The Polar Cool Tie. Very cool indeed!