Shoes are hard plastic that rubs sides of feet. And finally the fact that it is waterproof seals the deal. My previous favorite pair broke so I was on the hunt for some comfortable flip flops! However, its 5months later and the sole on the left shoe has split across the ball of the foot, the material on the right heel has split apart from the sole and alas I cant wear them anymore. I have a high instep aka tall feet. If they simply moved the charging port to the top of the speaker beside the buttons, then ONE short side of the speaker would be FLAT, and they would be totally flexible for vertical or horizontal use! Really satisfied and I’m going to start to try walking and running with them tomorrow! Amazon was very helpful and help me through the return process to receive my funds. These feel much lighter and alot more uncomfortable than the original AKG earbuds provided by samsung. The fit is great for my wide feet and the comfort level is very high.