the shell is made of silicone or the like material. principle is to say that for the Xcover 2 no envelope is required, since it is waterproof and shock-yes. for me the color was crucial and my idea, so that the red color of the phone is still visible. side is the shell completely transparent, at the back it is "milky". ie. no white color, but the material is rough, quasi knobbed. is very good in the hand. all important auspsarungen available, even side for attaching a trailer the envelope correctly white was excised. top!