Front material: Made of fleece, natural, breathable, comfortable, easy to wash and dry. Eyelet material: Made of wool, soft and comfortable, let your eyes relax completely. Adjustable elastic band: You can adjust the tightness of the elastic band. Depending on the circumference of your head, the tighter it is, the warmer your eyes will be. HEAT FOR EYES: The heated eye mask provides constant heat to soothe your eyes, keep them moist, comfortable and relieve fatigue. Say goodbye to eye bags and dark circles. USB powered: There is no battery inside, the eye mask is powered by a USB cable. Connect it to a USB port during use, we recommend connecting it to a computer or phone charger (such as Apple, Huawei, etc.). It is easy to take with you wherever you go. Simple and safe: The heating temperature and time can be adjusted by the controller, you can set 35/40/45/50C, 10/15/20/30 minutes according to your needs.