We ordered these shoes for our Croatia vacations. Because the shoes are required on the rocky beaches properly and also in the water you can not slip yes. It is made of rubber, it has a good grip and it dries quickly after being with him in the water. This is also an important argument, because if you want to go home, you have to wrap up no waterlogged shoes, as is the case with other slippers. The shoes are really great and are made to last. My last persevered 7 years, without tearing. In the second order I have ordered my size larger because it is better coming in into the shoe. (Eg size 39, rather 40 order). The shoe tends to be very snug around his foot, he sucks itself firmly at the bottom. But is not unpleasant and explains the good grip.