This ultra lightweight MTB model combines the performance technology of our Octane road shoe and an off road specific carbon sole with high traction lugs to create the lightest, fastest and most efficient mountain bike shoe available. Octane MTB 1:1 Power Plate: Octane Grade Uni Directional Carbon for ultra light stiffness Direct Vent technology for cooling and drainage concave shaping for enhanced plate stiffness and anatomic support and built in Longitudinal Arch Support for optimal support, power, and efficiency. 1:1 Anatomic Closure: follows the natural anatomic shape of the foot to eliminate hot spots and remove pressure from your instep. P.R.O. 1:1 Heel Cup: synthetic leather lining and external Carbon Power Band for maximum heel hold and power transfer. P.R.O. Insole with dual density EVA for optimal Longitudinal and Transverse Arch Support Pearl Izumi one piece upper with laser technology provides a second skin fit, minimum weight and maximum comfort. Molded TPU Toe Cap and high traction Rubthane lug tips deliver off road durability and traction.