Mad Rock Pulse Climbing Shoe Fine tune the length and volume of your climbing shoes between the Positive (High Volume) and the Negative (Low Volume) version Upper Material: Breathable Mesh; Footbed Material: Polyester Midsole Thickness: 1.8mm; Sole Thickness: 4.2mm; Rand Thickness: 2.2mm Sole: Flat X5; Rand: R2 Science Friction Weight (US 9): 7oz / 202g