SOFT AND CONFORTABLE: The heel grips with 4D design and made of durable silicone material, which is soft and comfortable to prevent the shoe from rubbing and slipping, helping the shoe fit better. STAY IN PLACE: The backing peels off easily and the heel pads adhere very nicely to the back of shoes. Long lasting and strong adherence so you dont have to worry about them falling off. SCOPE OF APPLICATION: Heel inserts are suitable for new shoes and slightly larger shoes, such as high heels, leather shoes, flats, boots etc. Works great, low profile and effective in adjusting wear of shoes. Material: Silicone. Pack in one pair, Product size: 9.4 * 3cm. XS size thickness 2mm, plus thin XS size is suitable for fitting shoes. S size thickness 4mm, thin S size is suitable for most size shoes, L size thickness 5mm, thick L size is suitable for one size larger shoes.