7i DP Project 23 Carbon Helmet Exceptional Protection Seven Intelligent Design Protection is back at it again with its new full-face helmet. Introducing the 7i DP Project 23 Carbon Helmet, a new take on 7i DP's downhill helmet with upgraded protection. The Project 23 Carbon Helmet features S. E. R. T. (Seven Energy Reduction Technology), a revolutionary impact and rotational forces management system that uses a slip-plane system to manage energy transmission in the event of a crash. The carbon shell uses 7i DP's Project Lab layering process to help reduce weight and absorb shock, making the Project 23 Carbon Helmet incredibly light and strong. 23 big bore vents provide superior ventilation and the AGION anti-microbial liner helps to keep the helmet smelling fresh. To add the finishing touches, a Fidlock magnetic buckle system was used to provide an effortless closure. Features23 big bore vents For maximum airflow. AGION Anti-microbial liner helps to keep things smelling fresh. S. E. R. T slip plane system Manages impact and rotational force energy. Adjustable breakaway visor Adjustable visor that breaks away in the event of a crash. SPECIFICATIONSCore Material EPSClosure system Fidlock magnetic buckle system Safety Certifications CE, CPSC Bicycle & ASTM F1952-15 (Downhill)Intended Use DH, Freeride Weight922g Sizing Size Extra Small Small Medium Large Extra Large XX-Large Head circumference (in)20. 8 - 21. 25"21. 6 - 22"22. 4 - 22. 8"23. 2 - 23. 6"24 - 24. 4"24. 8 - 25. 1"Head circumference (cm)53 - 54cm55 - 56cm57 - 58cm59 - 60cm61 - 62cm63 - 64cm | 7Idp | Project 23 Carbon Helmet Men's | Size Extra Large In Matte Ice Blue/black