BOA closures ensure quick and precise adjustment. Thanks to Shimano Dynalast technology, the feet don't tire so quickly and the driver can perform better. Specifications: Application: Cross Country Pedal system: 2-hole (SPD) Closure: twist lock Sole stiffness value: 9 (on a scale from 1 to 12) In order to find the ergonomically correct position of the feet on the pedals, we recommend the Cleat Tool from Ergon, so that the longitudinal orientation, support width (Q factor) and foot angle are optimally adjusted to you. - super stiff, lightweight, carbon fiber reinforced midsole - soft, perforated synthetic leather with high density for optimal ventilation and fit - Two independent BOA L6 twist locks allow quick fine adjustment of the tension - Adjustable Powerzone cable routing gives the forefoot a secure hold - Exclusive Michelin outsole with dirt-repellent tread pattern for best traction - Double density rubber composites offer just the right combination of hold, resilience and flexibility - Reinforcement of the cleat assembly for extreme conditions - Carbon fiber composite midsole - Harder contact block for more stability and pedaling efficiency - also available in a wide version - ideal in combination with the PD-M8100 pedal Material identification: Upper material: other, textile (synthetic leather) Lining and insole: textile (mesh) Sole: other (carbon, rubber) Technologies: Shimano Dynalast Shimano Dynalast is a sole construction with less toe elevation that promotes a smoother, more energy-efficient upward movement when pedaling. The benefits are higher performance, less fatigue and greater comfort for every type of driver. In addition, Shimano Dynalast is characterized by a lighter and thinner sole structure and a larger cleat adjustment range. Michelin For extreme demands in the trail and enduro area. Specially designed sole, the result of a collaboration between Shimano and Michelin: This sole is characterized by two density zones and a strategic knob pattern for better grip without compromising pedaling efficiency. BOA BOA locks offer fine adjustment to the millimeter for a perfect fit. Lightning-fast, one-handed adjustment, secure lock and quick release. Repel mud and water and are extremely light.