Dont lock the way I thought they would though. Auch die Kopfpolster an der Ohrmuschel lösten sich nach einen Wochen, deswegen bestellte ich auch ein ersatz Gerät mit der Hoffnung, es seinen ein einzel Fall. Mine stretched out a little with wear, so although they were only a smidge bigger than the sizing at start, two weeks in they are a half size larger, so be aware when ordering. Zudem sind die Schuhe robust und wasserfest. Hopefully the previous fulfillment issues are a thing of the past, but should you have any problems with your order, I can attest that they issued my refund promptly, and when I reordered, everything was perfect. And it is such great support for my back. Furthermore, while plastic (which is often not nearly as cheap as many peoples preconceptions), it feels very solid and well-built. Totalmente satisfecho con el servicio de Amazon. Theyre a tiny bit less open (i. Difficult to tell if ANC is on or off.