Fox Racing Mainframe Helmet Riding helmets Designed and developed specifically for 36653 577 S Designed and developed specifically for younger riders and drivers hard knuckle construction with an additional mid layer of impact foam for increased protection Adjustable TPR wrist closure system with hook and loop backing ensures proper fit Four way stretch Lycra® finger sidewall for flexibility Score big on safety without breaking the bank with the Fox Racing Mainframe MIPS Helmet – featuring Virginia Tech 5 STAR rating and MIPS® tech that redirects rotational crash forces to protect your brain The integrated MIPS fit system dials in a seamless