Bell Volt RL X Bicycle Helmet. For the heated as well as not so heated stints in the saddle, the Bell Volt RL X Bicycle Helmet provides a stellar balance of comfort, ventilation, and light weight that makes you forget it's even there. Cool air passes through the StreamJet channels and out the rear exhaust ports to regulate temperature and sweat. The Twin Axis Gear TAG fit system lets you dial in comfort quickly and easily. The Fusion In Mold Polycarbonate Shell with Internal Reinforcement provides maximum protection while its X Static Padding is quick drying and absorbs odors caused by sweat.