OutdoorGearLab

The Mainline MIPS is a newer model from Smith. This lightweight full-face was designed with input from Smith's professional enduro racers. It's pretty darn light, although a couple of ounces heavier than some of the other enduro-focused models we've tested, but it has a more substantial, confidence-inspiring feel. Smith's use of Koroyd helps maintain a high level of coverage and impact protection while still delivering excellent ventilation. This airflow is critical when smashing on the pedals in the middle of an enduro stage or grinding up that pesky climb in the middle of your shuttle lap. The Mainline carries a DH certification, and it felt more robust than some of the other helmets in the enduro sub-category. Yes, there are lighter options, but we feel the Mainline is an ideal blend of weight, ventilation, comfort, and protection.
While we loved the Mainline for its substantial feel and excellent weight-to-protection ratio, it does have some compromises. There are better options if ventilation is of the utmost importance. Yes, the Mainline has above-average airflow, but some models breathe a little better. We also don't think this is the best option for dedicated bike park riding or downhill racing. While it is DH certified, we'd recommend looking at a heavier-duty DH-specific helmet. The Mainline MIPS is on the pricey side of the spectrum. That said, we feel the asking price is justified for its quality and performance.
Read more: Smith Mainline MIPS review

The Smith Mainline MIPS is a relatively new lightweight full-face model. This was designed along with Smith's professional enduro racers. For a full-face helmet, it's pretty dang light. It isn't the lightest enduro-focused helmet, but it's close. It also has a more substantial, confidence-inspiring feel than some enduro helmets. Smith uses Koroyd in the construction to keep high levels of coverage, impact protection, and ventilation. This airflow is critical when pedaling hard uphill in the middle of an enduro stage or for those climbs in the middle of your shuttle lap. The Mainline has a DH certification, and it felt more robust than some of the other enduro helmets. We think this helmet finds the ideal balance of weight, ventilation, comfort, and protection.
While we loved the Mainline for its substantial feel and outstanding weight-to-protection ratio, it isn't perfect. If you're most concerned about ventilation, there are better options in the full-face helmet world. Though this helmet has above-average airflow, we found some other models breathed even better. Also, this isn't the best option for dedicated downhill racing or getting big air at the bike park. While it is downhill certified, we think getting a heavier-duty DH-specific helmet is a better idea for these applications. As you might expect, this option is on the pricey side. But it's a high-quality, lightweight, full-face helmet, so the asking price is reasonable when you consider this.
Read more: Smith Mainline MIPS review

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