These were listed as leather, but the whole shoe is a type of synthetic rubber. So I've decided to use them just around the home and outside including in wet conditions as they should be able to withstand moisture given the above, also the three points where the straps attach to the sole are not glued, rather they have bungs under the sole holding them together. Regardless, they were comfortable from day one. Possibly they could become a little loose with longer term wear. I would not want to wear them on a long walk though. I guess I shouldn't have expected leather for US$14, though they are a reasonably good looking pair of flip flops for the price, with nice metallic detailing.