Comfort and Protect Ball-of-Foot Absorb Shock and Prevent Calluses Keep Feet from Sliding Forward Cushion and Protect Ball-of-Foot Just place these durable foam cushions in shoes to instantly absorb shock and reduce pressure on the ball-of-foot area. Adhesive-backed pads help prevent calluses and stop feet from sliding forward in shoes. Extra protection for thin-soled footwear. 1 pair.