Material: Outside: polyester, inside: gel Color: Custom color Size: 28CM in diameter Weight: 480 grams Packaging: color box /PVC box or OEM packaging /OPP bag /PVC bag, etc. Function: heat treatment in winter and ice treatment in summer Features: Uniform heating without wire safety and environmental protectionNo wires in all aspects of the design, microwave heating only takes a few minutes to easily heat, the hat liner is environmentally friendly bio-gel, 100% safe and non-toxic. The inner material has good sliding resistance and high strength heat absorption. Contains up to 80% water molecule compound, can effectively absorb heat through the high conduction and diffusion of heat, can realize the human body hot compress In summer, it can be treated with ice therapy. The innovative water locking function can be used after 1-2 hours in the refrigerator. Do hair film below normal temperature, 60% of nutrition can be lost, use heating cap, can promote hair film nutrition absorption up to 90%! Use a heating cap when dyeing hair to increase the temperature, shorten the time of dyeing hair, and color more uniform and firm. Heating cap with baking cream or essential oil, through heat treatment to promote scalp blood circulation, improve body function, detoxification beauty.Hair treatment cap does not need to be plugged in, and can be used for hair treatment, ice treatment and heat treatment at the same time.