SIDI Algor Primaloft Cycling Boots Ultimate Cold-Weather Protection Experience ultimate cold-weather protection with Prima Loft insulation, ensuring warmth without extra weight. Enjoy all the stabilization and control with anatomical heel construction and Millennium Fit, designed for both sneakerheads and casual wearers. The YKK Zip closure provides reliable and smooth operation, while the X2NC sole with stiffness 7 and grip sole insert delivers peak performance and enhanced control. Reinforced toes and heels guarantee durability, making it unmistakably SIDI. Features Prima Loft insulation with anatomical heel construction X2NC Sole with stiffness 7 and a grip sole insert Reinforcements on toes and heel | Sidi | Algor Primaloft Cycling Boots Men's | Size 41 In Black/yellow Flourescent