Diadora x vortex pro mtb spd shoesdiadoras x vortex pro mtb spd shoes are for riders who put down a lot of horsepower on the trail featuring a stiff carbon fibre sole a comfortable and ventilated insole an ergonomic heel cup and a race fit these x vortex pro mtb spd shoes are at the cutting edge of mtb performance footwear stiff carbon solethe ultra stiff carbon fibre sole scores a huge 10 out of 12 on the stiffness index with excellent power transfer through the sole you can focus on blaz