So if it isnt exactly your size or snug, the rear will rub against your heel, possibly causing blisters. Seem to run about half a size big. I did amazon and got them same day and they worked the first time. They got here very quick. It?s not turning on after being used twice. Nevertheless the accessories and spares are very much appreciated and often not seen from audio products. The first pair of earphones I ordered worked wonderfully and lasted around six months (which for me is very impressive). Great sound and deep bass quality. Very stable this way, and keeps the boat hugged to the dock, with just enough play. The material is good quality and it has some weight to it, but is lightweight enough for the warmer seasons.