It offers a very good complete protection for the Xperia P and also covers the buttons "on / off", volume rocker and the shutter button. Songs can be characterized the press buttons only very difficult, in particular the two-stage shutter button. Here one could dispense with the recess of the material to make the "button" stand out more from the envelope.
Despite "silicone" has the envelope any non-slip surface as other, which is quite handy if you want to plug the phone into your pocket. From this then you get it easily and without great use out again.