The Ballistic Shell Gel Series SA0582 M355 Advanced 3 Layer Protection Case for Apple iPhone 4,4S offers three layers of protection. The first and outermost layer is made of soft TPU which will help absorb the shock of a drop and co molded onto layer number two, which is made of a touch impact resistant polycarbonate. Last but not least, the third layer, which is the inner most layer, is made of a soft silicone and also includes Ballistic corners, which means all four corners have extra shock absorption where you need it the most.