They also make tying difficult. Pretty easy to assemble. i already have lots of compliments from it! Sarebbe stato meglio specificare di dover scegliere un numero in più, così non si sarebbero stati problemi. However, I expected to get a new pair, not sandals that are already somewhat run down at the heel; the previous owner must drag their feet, lol. Would recommend:) They work nothing like a good old Magic Eraser brand. There is no disruption from outside noise at all and with music playing I can?t hear anything. After a few weeks of normal wear there is already a hole in the sidewall. Also have problems with it disconnecting randomly.