Height increase: You can choose between three heights (1.5 cm, 2.5 cm, 3.5 cm), the heel is not visible and boosts self-confidence. The increase in the size of the sole should correspond to the type of shoe (1 - 2 cm for leather shoes and 2 - 3 cm for sneakers). Suitable for men and women: it There are two types of insoles, for men (size L) and for women (size S). The calcaneal spur heel is suitable for most shoes such as boots, sneakers, work shoes, leather shoes, high heels, tennis shoes. Material: the sole that increases the height is mainly made of pu material, the shape of the insert is designed in a u-shape to fit the foot; The honeycomb engineered heel sole is designed to fully absorb shock and reduce pressure on the heel with every step, making it ideal for standing, walking or running all day. No slipping: with a viscous honeycomb bottom, it is particularly suitable for ultra-strong grip and very secure wearing inside the shoe. No residue. Save money: if they lose their stickiness, just wash and air dry them for reuse.