After years of rigorous development and professional athlete testing, THOR is proud to introduce the class-leading Radial motocross boot. The concept was simple; to create a quality boot, featuring premium materials and performance, at a price point that any serious rider could afford. The Radial boot is now ready for deployment to the motocross masses. Replacement Strap Kit for all Thor Radial Boots. Available in colors to match your boots. Note: One kit per boot.