Leatt MTB Enduro 4. 0 Helmet DH-certified protection. Trail-ready versatility. The Leatt MTB Enduro 4. 0 is built for enduro racers who refuse to compromise - full-face protection when the trail demands it, open-face freedom when the climb does. A structurally sound magnesium-locking removable chin bar converts from full-face to half-shell in seconds, and the adaptability runs deeper than that: a removable mouthpiece lets you dial in ventilation or button up for foul weather, while an adjustable visor accommodates goggles underneath so you never have to take them off on the climb. The DH-certified lightweight polycarbonate shell pairs with in-molded dual-density EPS + EPO impact foam and Leatt's 360deg Turbine Technology - three layers of protection working together against low-speed, high-speed, and rotational forces. At 810g, it's fully ASTM DH certified and NTA 8776 e-bike rated. Features DH-certified removable chin bar with easy-fit magnesium locking attachment system - converts from full-face to half-shell without removing the helmet, and includes a removable mouthpiece for customizable airflow or weather protection360deg Turbine Technology a 3-in-1 safety system of non-Newtonian energy-absorbing turbine discs that reduce rotational forces, absorb low-speed concussion-level impacts, and work alongside the impact foam for high-speed impact protection In-molded dual-density EPS + EPO impact foam for superior energy absorption across a range of impact speeds and forces DH-certified lightweight polycarbonate shell that meets ASTM F1952-10 (downhill MTB) and NTA 8776 (e-bike) certification standards18 vents optimised for low-speed airflow effective ventilation even when climbing, not just on descents Adjustable visor with breakaway function extends to accommodate goggles underneath, and breaks away on impact to reduce rotational forces Sunglasses dock port under the visor for scratch-free, secure storage when you switch to goggles on the descent Fidlock(R) magnetic closure for quick, one-handed chin strap operation Moisture-wicking, breathable, anti-odour, washable liner for all-day comfort and long-term freshness Neck brace compatible designed for optimal integration with Leatt and third-party neck braces3-year Leatt Helmet Replacement Program in the event of a crash SPECIFICATIONSShell DH Certified Lightweight Polycarbonate Impact Foam In-Molded Dual-Density EPS + EPORotational Protection360deg Turbine Technology Vents18Weight From 810g (1. 79 lbs)Safety Certifications AS/NZS 2063:2008, ASTM F1952-10, EN 1078, CPSC 1203, NTA 8776 (S-EPAC / E-Bike)Intended Use Enduro, Downhill, Trail, E-MTBSizing Size Small Medium Large Head Circumference (in)20 - 21. 625"21. 625 - 23. 25"23. 25 - 24. 75"Head Circumference (cm)51 - 55cm55 - 59cm59 - 63cm | Leatt | Helmet Mtb Enduro 4. 0 Men's | Size Large In White