. Diadora’s MTB SPD shoes, the X Vortex Racer II, are technical MTB shoes that offer performance alongside excellent comfort Breathable and Stiff MTB Shoe. Diadora’s X Vortex Racer II MTB SPD Shoes feature Morpho A.M. Cage technology, which ensures a hugely comfortable and stable fit. The air mesh fabric boosts air circulation to keep your feet at an optimum temperature. With a Boa® L5 Dial F closure system along with a Velcro strap and Comp MTB CR soles for effective power transmission, these Diadora X Vortex Racer II MTB SPD Shoes are ready for the trail Features: Sole: Comp MTB CRUpper: Suprell-Air Mesh, Morpho A.M. CageClosure: 1 Boa® L5 Dial F technology system, 1 Velcro strapStiffness Index: 6.0Arch Support: EVA, anti-stretch fabricHeel Cup: Inside ergonomic heel supportFit: Race PlusWeight: 320gTechnologies. Morpho A.M. Cage: The construction of Morpho A.M. Cage upper, made from anti-stretch Air Mesh and Supreltech microfiber ensures perfect closure and increases foot stability during thrust. Air Mesh fabric improves transpiration and comfort to guarantee top performance Buy Diadora Footwear from Chain Reaction Cycles, the World’s Largest Online Bike Store.