The design is absolutely poor as there are multiple areas that rub the back of the heel raw. Theyve been great, hubby loves them and my only regret was not picking up a pair of the smallest size for myself when there was a great deal on it! Seems to be of good quality. Was ich ebenfalls sagen muss, ist dass der anpressdruck recht gering ist, was von Vorteil für den Komfort ist, jedoch die Kopfhörer für sportlichere Aktivitäten ungeeignet macht. Well constructed, sturdy, simple and easy to use. They took about 20 days to get here, with limited tracking. 5mm audio cable for when Im using these with a device that requires the cable. Well worth it, very pleased with this purchase. Suddenly I feel like I just wrote the story of Goldie Locks lol I recommend if never had a pair to try on in store first as they feel a bit different then regular flip flops Size is true but wanted to be sure.