My Lenovo flip has a vegan leather back a.k.a. rubber. It never falls out of my pocket and I always have a firm grip on it, which I love. Unlike my Samsung flip which was so slippery. Once pulling out of my pocket, I somehow squeeze it in a way that went flying up hit the elevator ceiling, wall, wall, floor. Lie down on the couch cell phone hits the floor, sit down on a recliner, Cell phone is somewhere hidden in the bowels of the recliner. I was always dealing with Samsung repair for that thing. So I’d ask, why do they make them so slippery, but I already know.