Medzer S Type Radiotherapy Mask activates in 2 to 3 minutes at 65 degrees Celsius. Made from 3 mm thermoplastic with 22 percent reinforced perforations, it ensures durability, comfort, easy removal, and minimal shrinkage. Non toxic, odourless, and heatable in a water bath or oven. https://www.medzer.com/radiotherapy-mask/rm-1000c