Giro Source MIPS Bike Helmet Smith The M4S offers the unprecedented

The M4S offers the unprecedented versatility to switch between toric and cylindrical style lenses

and the cheek pads are removable for easy washing

and outdoor covers

Keep pushing day after day with up to 12 days of battery life

A midweight merino wool fibre beanie for running

Giro Source MIPS Bike Helmet Smith The M4S offers the unprecedentedThe Source Mips helmet combines advanced performance and protection in a rugged, trail ready design. Featuring deep coverage with aggressive ventilation from 17 vents coupled with deep internal channeling, it helps keep things cool even when the riding gets rowdy. And with the comfort and secure feel of the Roc Loc 5 Mips fit system with Integrated Mips brain protection, plus a moto style adjustable screw in visor and full lower Hardbody durability,