Height adjustable: There are four layers of 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 3.2 cm and 8 cm, which can be increased to correct the length of the leg or the difference in the length of the left and right leg.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 sizes 35-44).Cushioned air cushion design: This 4-layer insole features an elegant cushioned air cushion design with a decompression cushion airbag at the bottom, providing maximum comfort for your heels and making you feel relaxed all day long. It can be worn for long periods of time and is comfortable to wear. It provides cushioning and padding to the arch and heel area.Breathable and comfortable: These insoles circulate air better and prevent the accumulation of moisture. Ventilation holes are provided 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.