The "U-shaped stopper" firmly holds the heel, preventing these foot covers from slipping off: [Cocopita] These are a cotton-blend type with a moderate thickness. The outer yarn is 100% cotton, providing a soft and refreshing feel. The design is carefully tailored to the shape of the foot, offering a comfortable fit. The length is the [shallow] type, recommended for pumps. The simple design allows you to use them in various situations, both on and off duty. Sizes: Ladies 23-25cm Materials: Cotton, Polyester, Others Specifications: ・Length: Shallow ・Cotton blend ・U-shaped stopper ※ Silicone is used for the non-slip feature. Please refrain from using if you have sensitive skin or have experienced allergic reactions. ※ Packaging may vary depending on the production period. (Even for products of the same length, the packaging may differ, but there are no changes to the product specifications.) ※ We will use simple folded packaging. Thank you for your understanding. The price includes shipping.