The frequency of use (about 5 times in a short period) is low. Please check the condition of the heel wear in the photos. This model retains the functionality of the "Slip-on Sandals," which are designed to prevent the heel from lifting, while also allowing them to be worn with socks. It features Montbell's unique S-shaped thong. The thong that directly touches the instep uses a material that is gentle on the skin. It combines an open feel with excellent hold, making it easy to wear for camping or everyday use. Design registration pending. Specifications [Material] Upper: Polyester, E.V.A. foam Outsole: Rubber [Color] Black (BK) [Size] XL (28.0-29.0cm)