Height Adjustable:There are four layers of heightening insoles, each layer can be moved separately, 1 layer: 3 cm, 2 layers: 4.5 cm, 3 layers: 6 cm, 4 layers: 7.5 cm, the height can be adjusted between 3 cm and 8 cm, which can be increased The length of the leg or correct the difference in the length of the left and right legs.Insole Can be Cut:The back of the insole is designed with a size line and shows the size of the shoe. You can customize the insole freely, allowing you to easily cut the insole to fit the shape of the shoe. The length of this four-layer insole is about 270mm, suitable for all types of men's Or women's shoes and boots. Suitable for UK Women (3-6) and UK Men (7-10).Cushion Air Cushion Design:This 4-layer insole uses a smart cushioning air cushion design. The cushioning air cushion can provide maximum comfort for your heels and make you feel relaxed all day long. It can be worn for a long time and is comfortable to wear, and adds cushioning and filling effects to the arch and heel area.Breathable & Comfortable:These insoles are designed to better circulate air and prevent moisture accumulation. There are ventilation holes on the front sole of the insole to prevent the growth of odor-causing bacteria, so that your feet are always fresh and odor-free. The insole can be cleaned quickly and easily to maintain a good level of hygiene.Breathable & Comfortable:These insoles are designed to better circulate air and prevent moisture accumulation. There are ventilation holes on the front sole of the insole to prevent the growth of odor-causing bacteria, so that your feet are always fresh and odor-free. The insole can be cleaned quickly and easily to maintain a good level of hygiene.