Monoprice 109937 TPU Case for iPhone 5 - Retail Packaging - Black Protect your iPhone 5 from scratches scuffs drops and shocks with this heavy-duty TPU Case from Monoprice! TPU (thermoplastic polyurethane) is a flexible material that combines the benefits of silicone and polycarbonate TPU can be made with different variations which give it either more flexibility or more stiffness In this case the TPU material has been stiffened somewhat so that it is still flexible but provides greater stiffness to absorb and disperse shock forces from a drop or fall