Holds my kayak with no problem for good distance at speeds of 70 +/_. Theres no flaws with the shoes, the white material could be taken for cheap but I actually like it because its soft and comfortable. Feels smooth and Ventilated as these have "THOUSANDS" of holes????. For the first month or so, these were WONDERFUL. If youre looking for a book that will tell you many things that are only sort of related to the telephone book then this may be for you. I like everything about the shoes, size, style, color, and etc. So now that I have a great set of ear monitors, I was able to fully evaluate them. I want readers of this review to know that these flip-flops were not heavily used, just general walking around. Musical Performance? Very good. Facilísimo de entender el funcionamiento, el pitido es potente, la app funciona muy bien.