Really? Velcro strap on the back? I give these 1 week before the velcro no longer sticks because it gets fuzz in the velcro feom the floor and socks. The strap on back was designed to be a guide to prevent the foot feom slipping out all the way! Bad choice to purchase! Very insatisfied! Now I hear kfft kfft when the velcro tears away at my socks! Awful