What's included: Boostinator kits consist of a specially-designed axle end cap

Ventilation channels in the back padding ensure optimal air circulation and heat dissipation

Ventilation: 22 meshed ventilation ports

impact and friction resistance

Lowest profile of any trainer

Crank Brothers Mallet Trail BOA Clip-In Shoes - US 12 - Black - Gold Virtual Parent What's included: Boostinator kits consistSome things just work better together. Like an optimized shoe pedal combination. Crankbrothers Mallet clip in plays nice on the race track and at the bike park. It has a ramped Match cleat box for easy front and rear pedal entry and for mud shedding. A Race Zone setback on the cleat track allows the cleat to be positioned further toward the heel for added stability when descending. OUTSOLE: Match Box optimized for any MTB pedals Race Zone for control