Sea to Summit TPU Guide Waterproof Case for Smartphones nylon Low profile design feels great in your hand Meets IPX8 testing standards of being waterproof at 10 meters for 1 hour High strength TPU construction is abrasion and UV resistant, will not crack in extreme cold RF welded seams for strength and waterproof construction. 0.15mm optic grade and touch compatible TPU screen and camera port Fits iPhone 4, 5, and SE As an airproof barrier in our Air-Sprung Cell and Self-Inflating mats. Here it is used in a liquid-extruded format  the TPU bonds to the face fabric for the highest possible level of reliability. As a waterproof barrier in our Accessory Guide Cases and Map Cases; and in several models of our Dry Sacks. Here it is used in a film format, where its superior flexibility (even in cold weather) and waterproofness are key. As a waterproof barrier in the Nylon Folding Bucket. This particular film is also food grade  ideal for water storage. As a transparent window in View Dry Sacks and Travelling Light products  allowing you (and TSA inspectors) to see the contents.