The medium was too small and the large is a little big, but thats ok. Looks like someone may have tried to straighten one out, which now looks completely warped, bent and paint missing. Horrible thin sound. Its a great deal for the price. Ive had to put a padding between the strap and my foot for comfort. The packaging of this wireless charger stands out from the normal consumer rectangle package. Im going to make the fix and will update accordingly. I have 3 daughters and these are THE summer sandals of choice in our house! Im a 10 in all other dress shoes and sandals but 11 in running shoes and other tennis shoes. Great sound fantastic product