Sidi Nix GTX Cycling Boots – White/Black Size 42 Millenium Fit. With the Sidi Nix cycling boot experience the perfect blend of eco-friendly weather resistance and unmatched stability with the new Gore-Tex 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.