Product Description Material: PVC Size: 35-44 yards (225-270mm), increased by 3-7.5cm Style: Style 1, Style 2 Colour: Black Quantity: 1 pair Package content: 1*PU inner heightening insole 1.Adjustable Height 4 layers design, Adjustable Height-Increase(3-7.5cm) and air cushion shockproof.Fit most style of shoesBoot, Sneaker, and trainer etc..... Inserts are best worn with a shoe slightly larger than your normal size. 2.Removable sole lets you choose your desired height Discreet- no one will know you're wearing them. Perfect for a night out, special events, meetings, weddings, or any event where there is a camera lurking about. 3.Great Material Mainly made of synthetic elastomer, super elasticity, shock absorbent. 4.Durable with a Long Product Life They are also used to reduce pressure on the back and knees when walking. This is proven to effectively reduce spinal shrinkage with age. 5.Strong Protection The air cushion protects your knees and ankles, balances foot pressure and is suitable for standing for a long time.