Height Adjustable: Height Increase Insole There are four layers of insoles, each layer can be moved separately, 1 layer: 3 cm, 2 layers: 5 cm, 3 layers: 7 cm, 4 layers: 9 cm, the height can be adjusted between 3.2 cm and 9 cm, which can be increased to correct the length of the leg or the difference in the length of the left and right leg.Cushion Air Cushion Design: This 4-layer insole features an elegant cushion air cushion design with a decompression cushion airbag at the bottom, which provides maximum comfort for your heels and makes you feel relaxed all day long. It can be worn for a long time and is comfortable to wear. It adds cushioning and filling to the arch and heel area. .Shoe size can be cut. The back of the insole is provided with a size line and indicates the size of the shoe. You can freely adjust the insole, so you can easily adapt the insole to the shape of the shoe. The length of this four-layer insole is approximately 270 mm and is suitable for loose men's or women's shoes and boots. (Suitable for shoes size 35-44). .Breathable and comfortable: These insoles circulate air better and prevent the accumulation of moisture. There are ventilation holes in the front of the insole to prevent the growth of odor-causing bacteria, so your feet are always dry and odor-free. The insole can be cleaned quickly and easily to ensure a good level of hygiene.