Belt type with 3-layer frozen gel to fit your forehead and keep it cool. Freezing gel that hardens when frozen in the freezer. Cold for 120-150 minutes (Current Product Duration: 60 - 90 minutes) Comes with a dedicated washable cover. Can be re-used. Supports forehead circumference sizes from approx. 18.1 - 26.0 inches (46 - 66 cm). Suitable for adults and children. Recommended Age: 4 years and up. Summer sleeping For heating. When you are studying or want to keep your head clean. Ingredients: Water, gelizer, preservative. How to Use: Unfold this product and place it horizontally in the freezer for 4 hours or more, then place it in the dedicated cover.