Perfect housing for the heel due to its bowl shape and the hypoallergenic polyester fabric which improves comfort and breathability and impedes bacterial growth. Easy to wash. New attachment system that uses Velcro to stick to the footwear so it does not move. Ideal height which allows it to be adapted to any type of footwear. It is a long term product due to its greater silicone resistance. Made from 2 density silicone.