Sea to Summit TPU Guide Waterproof Case Our TPU Guide Waterproof Case for Smartphones is a svelte yet robust solution for protecting and using your phone in all conditions. Welded Thermoplastic Polyurethane (TPU) and double hook and loop® roll top construction keeps this soft case both watertight and slim. The 0.15mm optic grade TPU face and camera port gives a clear screen and allows unimpeded use of the touch screen and camera. The TPU is PVC free strong flexible durable UV and extreme cold resistant. Die cut anchor loops round out this tough little package.