Super I find the cover that they are not so limp is by TPU silicone compound as a pure silicone sleeve, but not as hard as this very hard Smartphone Cases. You put the shell to the smartphone and has the feeling that she also sits properly
In addition, my smartphone comes with no cover before very slippery. Also, this issue is resolved with this envelope. In addition, attached to the sides of the envelope "spikes" that make the envelope and its contents again more slippery.
It is also good that all buttons are accessible and neither camera nor speakers are covered by the sheath.