The Gel Achilles Tendon Protector is a soft, Anatomically designed comfortable stretchable Nylon / Lycra fabric sleeve. This unique device helps absorb and eliminate friction, pressure and shock to the back of the heels and ankles.  Protects the Achilles tendon and achieves excellent results in all athletic footgear.   It is engineered to keep the gel pad in position.  Ideal for the prevention of blisters & chafing.