The ball of the foot pad evenly distributes body weight due to pressure and friction calluses ( hardened skin) may form. Calluses can cause discomfort when walking such as a burning sensation under the foot or a feeling of walking on stones. Epitact Plantur Cushions eliminate calluses and cushion the ball of the foot to help relieve pain. .n Relieve ball of the foot pain.n Thin and comfortable pads.n Can be worn in all types of shoe.n Small UK size 4-5.5 EU 36-38n Reusable and machine washable.