SHOE DOCTOR SUEDE HEEL GRIPS. These Heel Grips offer invisible protection, help prevent blisters on heels and provide extra grip. Fabrication: Natural Suede Leather. These self-adhesive Shoe Doctor Suede Heel Grips offer invisible protection, help prevent blisters on heels and provide extra grip. Great for loose fitting shoes. Blister prevention aid. 2 x PAIR VALUE PACK.