FOX Nobyl Fri Thick Motocross Socks Thick and comfortable motocross socks. Riders who prefer wearing thicker socks inside their motocross boots need look no further than the Nobyl Fri Thick Socks. With thick construction providing a comfy, padded fit and with ample arch support, they’re the perfect pair of thick socks to slip on for your next ride. Features: Thick construction for a padded comfortable fit Arch support