These insoles are worn under your socks. They naturally increase your height. They feel natural even when you take your shoes off! Made of skin-friendly silicone material, they can be easily washed with water and reused. The sole is one-piece, so you don't have to worry about them slipping off or getting lost. They also have ventilation holes, making them less likely to get stuffy. Please give them a try! [Product] Silicone Type Secret Insole 3cm (for both feet) 1 set White, 1 set [Product Details] Size: Free size (fits 22-27cm) Color: White Heel Height: Approximately 3 (cm) *Slight compression may occur, so individual differences may apply. Material: Silicone Quantity: For both feet Men's and women's unisex *This product is imported from overseas. There may be some fiber attachments or small stains. This does not affect the use of the product. Please understand before purchasing. *We thoroughly inspect our products, but if you find any defects, please contact us before leaving a review. *Returns due to differences in product image or size are not accepted. *Products will be compressed for shipping. Thank you for your understanding.