I wear a size 8 so ordered an 8 and they fit perfectly. I usually either have to dissemble bikes into bits and pieces for storage in backseat and trunk or lay them in the trunk with wheels sticking out and ropes everywhere. Two of my colored lava stones were broken but that was the only thing damaged. I consider this to be a serious flaw. I honestly didnt know they made baby extension cords. There are other reviews that mention this. from PA and I don?t think I?ll ever buy an expensive set again. Everyone with whom Ive spoken to while using the buds can hear me clearly. They are doing the their job right now but fee like they will come apart with any extended use outside of wearing them around the house.