Here is a simple, yet effective cooler 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 power of the Polar Neck Wrap, Wrist Wraps or other Polar-Products personal cooling gear. Add one to your order! Every order ships with a free cool tie.