PROTECTIVE DESIGN By using Japanese Asahi Tempered Glass 7H, you can be sure that your iPhone is protected from everyday scratches, smudges and heat. HEAT RESISTANT The tempered glass material is heat resistant, so you can go out in the sun and know that your phone won't overheat and turn off in the middle of an activity or an important text message. ULTRADÜN The screen protector is made of ultra-thin tempered glass, 0.3mm thick to be exact.