Bell Slant Bike Helmet. Versatile, stylish and affordable, the Slant is an exceptional helmet at an amazing price. Features 21 channeled vents, a Fusion In-Mold Microshell, ErgoDial fit system, easy-adjust Cam-lock strap levers, and a Blade Visor. Fusion In-Mold Microshell and ErgoDial Fit System. 21 Vents with Channeled Ventilation weighing 10.6 oz / 300g. Cam-lock Levers and Blade Visor. Universal Adult Sizing (58 - 65cm).