Montbell Sour Sandal Rubber (Size L). Used twice on rocky shores. Didn't slip at all, even on wet rocks. The soles show almost no wear. There are some scratches near the Montbell logo on the strap. (From the manufacturer's website) Product Information These sandals can convert the felt soles of your existing river climbing shoes to Aqua Gripper soles, which provide excellent grip on wet rocks. Simply attach the soles by securing them with the straps. Specifications Material: Aqua Gripper Weight: 183g (size M, per foot) Color: Black (BK) Sizes: Compatible shoe sizes: S (22.0-23.5cm), M (24.0-25.5cm), L (26.0-27.5cm), XL (28.0-29.0cm) *Compatible shoe sizes are based on Montbell products "#1125122 Sawar Trekker" and "#1125123 Sour Climber." Depending on the shape of the shoes, they may not fit even within the compatible size range, so we recommend trying them on at a store. I discarded the packaging bag and tags when I opened them, so please refer to the following Montbell online shop for the instruction manual. https://webshop.montbell.jp/sp/ Thank you for looking.