The perfect edging machines.... nothing better in the world, when you are scared like hell an you need to trust a pice of sh@t of edge, they come like superman and holds you..... also the rubber is very durable... not the most sensitive but you dont need sensitive shoes when is a matter of precisition and grip... also they are very suportive for long routes,,,, if you buy a small pair you will get alot of precision an edging but also alot of pain... if you buy a more confotable pair the edging will be enough to trust really tiny edges....