The 509 Tactical 2.0 Enduro Helmet with Fidlock® magnetic strap buckle offers the latest in performance from our bestselling Tactical Offroad Helmet family. Optimal airflow and comfort combine with industry-leading safety and style to make this the greatest deal going in dirt. Its unique performance includes Venturi Venting with shutters you can open or close to create negative pressure that pulls moist air out for uncompromising comfort and visual clarity.