The fox proframe helmet is the lightest and most breathable full face helmet we have ever created with open faced breathability and dh certified protection it gives you the flexibility and confidence to ride any trail product details our lightest dh approved full frame helmet at 750 grams for a size medium fox integrated chinbar is secured to the main helmet structure with our patent pending system highly breathable liner system is moisture wicking and has anti microbial properties 24 big bor