Made for going big, going fast, or both, the Smith Mainline is the pinnacle, downhill certified enduro bike helmet. Safety innovations like KOROYD™ and Mips® provide energy-absorbing impact protection so you have the confidence to get aggressive on the trail. It doesn't matter if you're slaying the EWS in Whistler or suffering through the last stage of your local enduro race, you need a breathable, lightweight helmet that pairs well with goggles and fits like a glove. The Mainline integrates with your bike goggles for efficient venting and fog-free vision. Multiple pad sets including liners and neck-rolls let you customize the fit. Protection: Complete KOROYD® coverage for lightweight, energy-absorbing and ventilated impact protection Mips® Brain Protection System reduces rotational forces caused by angled impacts to the head Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older as well as CE EN 1078, NTA8776 E-Bike and ASTM F1952 Downhill Fit / Integration: Designed for ultimate integration with Smith performance goggles for maximum comfort, venting and storage convenience AirEvac ventilation system integrates with Smith goggles for fog-free lenses Three washable cheek pad kits, two crown liners and two neck rolls let you fine-tune the fit D-ring chin strap fastener for a snug fit Features: 21 fixed vents for consistent airflow Adjustable visor Hybrid X-STATIC® / Ionic+® anti-bacterial performance lining for odor resistance Weight (Size M, Mips®): 27 oz / 770 g .helmet-size-chart { width: 100%; max-width: 400px; border-collapse: collapse; font-family: Arial, sans-serif; margin-top: 1em; } .helmet-size-chart th, .helmet-size-chart td { border: 1px solid #ccc; padding: 10px 12px; text-align: center; } .helmet-size-chart th { background-color: #f5f5f5; } .helmet-size-chart td:first-child { text-align: left; font-weight: bold; } Size Head Circumference (cm) Small 51 - 55 cm Medium 55 - 59 cm Large 59 - 62 cm
