Sea to Summits TPU Guide Waterproof Phone Cases are a slim yet robust solution for protecting and using your phone in any conditions. RF welded Thermoplastic Polyurethane (TPU) and the zip lock, triple-roll hook-and-loop fastener keep this soft case both watertight and slim. The TPU is PVC free, strong, flexible, durable, UV and extreme cold resistant. Die-cut attachment points round out this tough little package.