Made with a VibramR compound for maximum grip. Created to give you the right degree of flexibility when walking and support your foot when pedaling while the tread design eliminates all traces of mud. You get an added bonus with this collection: the Gore Tex membrane. The membrane contains 1.4 billion microscopic pores per square centimeter. These pores are 20,000 times smaller than a water droplet, but 700 times larger than a water vapor molecule, which makesthe membrane COMPLETELY WATERPROOF with MAXIMUM BREATHABILITY. An absolute must in any weather and during real intense, prolonged performances.