GET IMMEDIATE RELIEF from the friction that causes painful rubbing, calluses, and blisters on the back of your heels. ENGO patches immediately reduce friction, protecting your skin. WEAR THE SHOES YOU LOVE! If you dread putting on your favorite shoes because of painful heel blisters, this is the solution for you. Put an ENGO patch in the part of your shoe that's rubbing your foot, and you'll immediately feel the difference. DESIGNED FOR YOU! They're a perfect fit for athletic shoes, but also fit in all types of footwear including: cleats, skates, high heels and dress shoes.