Gaerne artix winter mtb spd bootsdesigned for riding in extreme cold and wet weather conditions and featuring a new sole designed specifically for mountain bike use featuressolemtb 3density soledirect from the research and development team at gaerne comes the new mtb 3density sole a new sole designed specifically for mountain bike use the structure of the sole combines both nylon and fiberglass materials making it durable lightweight and thin the tread has been designed to ensure maxi