1. Season : features crystal super-soft plush for a warming touch and bamboo fiber for a cooling sensation; inserted with non-toxic and non-irritating glass bead bag to help with pressure relief and muscle relaxation,it also for microwave and freezer, treat your eyes with a hot and cold spa to relax and refresh. 2.Adjustable Elastic Band: Ergonomically designed to conform to your head and face, the flexiblestrap holds the mask in place through hours of sleep. Wear it for naps or all night long to get quality shut-eye anytime, anywhere. 3.Detachable Bead Bag: The glass bead bag massages muscles around the eyes to relieve fatigue and stimulate deep sleep through deep-touch pressure. 4.Easy Care: is designed with a high-grade zipper that opens and closes smoothly, making the inner bag replacement and mask cleaning super handy; both hand and machine washable.