It is made with 100% mulberry silk which is lightweight and has a perfect touch which can intimately cover your eye skin. It is smooth, soft and very comfortable to wear. Also it is breathable and friendly to sensitive skin.It's designed to have 3-class heat temperature settings from 104 to 140 degrees Fahrenheit. It will stop working automatically when time is up.Easy to adjust the strap and comfortable to wcear; fits different head sizes and will not compress your head.It can be easily powered by PC USB port, power bank, USB adapter and is packed with a lovely carry bag. Free to take it everywhere you go.It's a good choice for you to enjoy it when you go into deep sleep at home, take a rest for eyes at office, enjoy yourself on travel and have an eye spa in the hotel.