The Xperia Tipo is indeed quite smooth yet and threatens to slip quickly times out of hand. An ordinary envelope was needed. The Mumbi TPU Silicone is really worth every penny. The positive reviewers have promised too much. Optical noble, the phone is so good in the hand, on the sides additionally grooved for great grip. The feel is great. The material of the shell seems not fluff - like normal rubber cases - to attract but rather dismissed. The phone fits in perfectly, nothing wobbles / slips. With an additional screen protector mobile phone is well protected. Strong buy recommendation and super fast delivery, thank you.