Gaerne g record shoesgaernes eps light evolution soles on these g record shoes are constructed from nylon and the ultra thin soles reduce the distance between the feet and pedals to allow for optimum pedalling power non slip rubber insertsthe non slip rubber inserts in the front and back of the soles provide extra stability when you are off the bike and the soles are compatible with most available quick release pedals increased comfortthe tongue is perforated to allow for better breathability