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REI pre-order gives sneak peak at upcoming Smith Mainline MIPS Full Face Helmet

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The Rocky Mountain Race Face Enduro Team has been spotted rocking Smith Optic’s first ever full face helmet. Jesse Melamed’s Instagram gives us a sneak preview of the Smith Mainline Enduro Helmet; he and team members Andréane Lanthier Nadeau and Remi Gauvin are pictured wearing the new lid.

Now REI has released details, offering pre-order of the Smith Mainline for $300. Here’s what we know so far.

Smith Mainline Full Face Helmet

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This $300 enduro helmet is Downhill Certified to ASTM F1952 standards. It’s a single piece full face helmet that fastens with a moto-style D-ring strap. It is made up of a lightweight Aerocore in-mold construction with a polycarbonate shell. Twenty-one vents provide ventilation, a key consideration in the construction of modern enduro helmets.

The Smith Mainline has a claimed weight of 765 grams

Like the vast majority of Smith’s mountain bike helmets, the new Smith Mainline full-face helmet features complete Koroyd coverage. Utilizing crumple-zone cylinders that crush uniformly on impact, Koroyd is said to manage energy more efficiently with less volume than traditional protection materials.

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The Smith Mainline also gets MIPS rotational impact protection, a technology that has become a mainstay across high-end mountain bike helmets. This head-interfacing liner moves 10mm to 15 mm in all directions independently of the helmet’s shell. This reduces the likelihood of rotational impact-induced concussions.

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The new Smith Mainline full face helmet is available in three sizes; Small, Medium, and Large, which will fit head circumferences of 20.1″-21.7″, 21.7″-23.2″, and 23.2″-24.4″, respectively.

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Each comes with its own set of three different-sized cheek pads, two sets of sized crown liners, and two neck rolls so riders can get a perfect fit. Said pads are made from an antibacterial Hybrid X-Static/XT2 material.


The new Smith Mainline features an adjustable visor, compatible with POV cameras and lights. The rear is shaped with a lip near the top, presumably to allow for secure goggle fitting.

Pricing & Availability

new smith mainline full face enduro helmet available black green colorways

No word on availability from Smith Optics yet but the Smith Mainline is available to pre-order now from REI for $300. Get it in two colorways; a green-ish colorway to be worn by the Rocky Mountain RaceFace enduro team and black. REI’s pre-orders ship within 30 days.


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