The Mainline is a DH-certified (ASTM F1952) enduro helmet designed by Smith's team of product designers and engineers. The product was developed with input from professional Rocky Mountain Enduro athletes Remi Gauvin, Andreane Lanthier Nadeau, and Jesse Melamed. The helmet is available in three colorways, including a Sea to Sky-inspired version.

• Lightweight in-mold construction with full Koroyd coverage
• Multi-Directional Impact Protection System (MIPS) lining
• 21 optimized ventilation openings
• Internal air channels and AirEvac channels for maximum ventilation and breathability
• Adjustable visor and chin strap with D-ring
• Includes three sets of cheek pads, two sets of crown pads and two neck rolls for a custom fit
• Hybrid X-Static and XT2 antibacterial materials
• Finish: Matte
• Color name: White - Black
• Color: White/Black