Best used while down on the bed Enhanced effectiveness - The non-toxic gel in the middle layer of the cap enhances the performance of deep conditioners, restructuring agents, hot oils and other hair treatments in just 15 minutes. In the summer you can leave this cap in the fridge for 1-2 hours to condition your hair in cold therapy. Cordless and easy to use - no need for sockets or batteries The shower cap is cordless and only needs to be heated in the microwave for 1 minute to warm up. We recommend wearing the shower cap over your ears before using this product. When using it for the first time, it is best to place it in boiling water for about 5-8 minutes to pre-heat the gel, take it out and let it cool. Then wrap in a dry towel and microwave for 30 seconds to test the right temperature until you know how to heat it up to about 60 degrees Celsius. Please do not exceed 2 minutes to avoid damage to the product Fits most sizes - the elasticated trim allows the hat to fit most head sizes. Good quality and superb functionality