A3 Mips Helmet

What Our Gearhead® Experts Are Saying:

"Compared to other all-mountain helmets at this price point, the A3 MIPS stands out for the combination of extended coverage and ventilation. Most helmets that offer this level of temple and base protection compromise on airflow, but the A3 runs 16 vents without giving up structural integrity. The breakaway visor is a genuine differentiator — most competitors use visors that stay attached through a crash, which can increase rotational forces on the neck. The MIPS layer and the visor engineering together address impact management more completely than most helmets in this category."

Helmet performance in real riding conditions comes down to three things: how well it manages impact, how well it fits, and how well it handles the heat of a long day on trail. The Troy Lee Designs A3 MIPS addresses all three with a level of engineering detail that holds up against the best all-mountain options in the category.

The polycarbonate shell and EPS foam construction handles direct impact reliably, but the MIPS layer is what separates the A3 from helmets that only address straight-line forces. Rotational acceleration is the primary mechanism behind concussion in most cycling crashes, and MIPS technology allows the helmet to shift independently of the head during an angled impact to reduce that force transmission meaningfully. The extended temple and base coverage adds protection in the areas most exposed during a real crash without adding the weight or restriction of a full face design.

Sixteen vents run through the shell to keep airflow moving during climbs and sustained efforts, a meaningful advantage over enduro lids that prioritize coverage at the expense of thermal management. The breakaway visor introduces an additional layer of impact engineering that most competitors overlook entirely — designed to release cleanly from the helmet through a fall rather than remaining attached and introducing leverage forces to the neck and head. The rear stabilizer fit system delivers a precise, adjustable fit that stays consistent through the duration of a ride, and positioned foam manages sweat effectively across long days in the saddle. At 13.2 ounces the A3 MIPS wears light for the level of protection it delivers.