Monoprice TPU Case for Motorola Droid and Droid X2 - Retail Packaging - Purple The TPU (Thermoplastic Polyurethane) case is a nice compromise between the flexibility of the soft silicone skin and the stronger form factor of the harder crystal and rubber cases The TPU material is highly resistant to scratches and fingermarks It is pliable yet resistant to tearing making it good-looking and long-lasting alternative to other materials