The Terra X shoes by Fizik - optimal grip The Terra X are absolutely robust, light, comfortable and flexible. The Boa fastener in combination with the Velcro fastener allows you to precisely regulate the fit and makes getting in and out quick and easy. Specifications: Application: All Mountain, Enduro, Cross Country Pedal system: 2-hole (SPD) Closure: twist lock, Velcro fastener Adjustment aid for pedal plates: 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. Features: - TPU studs - carbon reinforced sole - Laser-perforated Microtex upper material for air circulation - BOA L6 twist lock for a perfect fit Material identification: Upper material: textile Lining and insole: other Outsole: other Technologies: BOA system: The BOA fastening system is a quick lacing system for easy on and off of the shoes. Fixed adjustment with one hand - by turning the BOA fastener, the shoe is evenly adjusted to the driver's foot.