The new standard in durability and impact protection, the elite series heel saviors will double to triple the impact protection of stock insoles and increase impact protection to the max when placed under footprint insoles. The two sizes slope from the listed 10 or 5mm to 2mm so it should fit any shoe. If you have a shoe that's generally thinner, such as Converse, we recommend getting the smaller size to prevent a tight fit. A highly resilient skin protects the inner foam for lasting durability and protection from blowouts. Expect these to last all year. Keep in mind these are sold in pairs!