The hat has a cooling effect on the head. Small and flexible. Elastic in the neck makes it fit different head sizes. Can be worn under a helmet or hat Several studies show that the body feels best from an evenly cool body temperature. It reduces stress, speeds up recovery during physical exertion and relieves problems with various types of joint diseases such as MS. Several athletes in various sports use cooling products for faster recovery and better results. The products are also used in warm work environments. The products work cooling, not cooling down! 1. Put the product in cold water for 1-2 minutes. Pick up and squeeze out. NOTE! Do not twist 3.Put on the product. It will cool you 6-8 degrees for 8-10 hours (usually longer than that) .4. After use, hang the product for drying.5. Machine wash at 60 ° C without fabric softener or bleach. Hang-dried.