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Leading the charge is the 509 Altitude 2.0 Carbon Fiber Helmet with a new hand lay-up carbon composite construction that’s lighter, stronger, and straight-up sleeker than anything before it. For those who like to get aggressive, it includes the Fidlock® magnetic strap buckle for easy one-handed operation, a built-in universal camera mount, plus airflow control venting.\n\nFeatures:\n\u003cul>\n\u003cli>Hand lay-up carbon fiber composite construction\u003c/li>\n\u003cli>XS to 4X sizes available in three shells for optimal fit and minimal weight\u003c/li>\n\u003cli>Upper vents with on/off shutter closure for airflow control\u003c/li>\n\u003cli>Fidlock® chinstrap strap closure for easy in and out\u003c/li>\n\u003cli>Go-Pro® mounting capability, improved design\u003c/li>\n\u003cli>Perfect fit between helmet eyeport and 509 goggles\u003c/li>\n\u003cli>Pro-Series Breathbox for complete protection, removable for optimal air flow\u003c/li>\n\u003cli>509 helmet bag included\u003c/li>\n\u003c/ul>\n\nSpecifications:\n\u003cul>\n\u003cli>Weight - DOT/ECE 1150 grams\u003c/li>\n\u003cli>Terrain - Mountain\u003c/li>\n\u003cli>Flow - Medium\u003c/li>\n\u003cli>Starting Weight: DOT/ECE 1150 grams\u003c/li>\n\u003c/ul>\n"