With the Sidi Nix cycling boot, experience the perfect blend of eco-friendly weather resistance and unmatched stability with the new Gore-tex(R)EPE Membrane. Enjoy all the control without the extra weight thanks to anatomical heel construction and Firmor lateral support technology. The Millennium Fit, combined with a wrapping strap and high-density dialing system, ensures incredible stability and comfort for every wearer. The R2CC sole, with engineered inserts and reinforced toe and heel areas, guarantees durability and peak performance in the toughest conditions. -Gore-Tex(R) EPE Membrane provides eco-friendly weather resistance -The wrapper closure system provides streamlined and secure enclosure around the foot -Firmor surround stabilizes the ankle and foot with a stabilized fit -Winter-proof and optimized to keep thermal balance -High density dial system maintains tension for a secure fit -A reinforced toe keeps the foot always protected -R2CC sole has a stiffness level optimized for power transfer, but facilitates walking