SMITH Session MTB Cycling Helmet with MIPS - Lightweight Protection

Our review of the SMITH Session MTB cycling helmet finds it best suited for mountain bikers who want a light, well-ventilated helmet with modern impact technology. The single biggest reason to consider this helmet is the combination of full Koroyd coverage and the MIPS Brain Protection System, which together focus on reducing both linear and rotational forces without adding unnecessary bulk. Riders who prioritize airflow, eyewear integration and a secure, easily adjusted fit will appreciate how the helmet balances protection and comfort on trail rides.

Key Features

• Koroyd coverage: Provides lightweight, energy-absorbing structure that vents efficiently to help manage impact forces while keeping the helmet cool on long climbs.
• MIPS Brain Protection System: Reduces rotational forces from angled impacts to offer an added layer of safety beyond traditional liners.
• VaporFit dial: Offers a 270-degree fit adjustment with a single turn of the dial so the helmet sits snug without pressure points.
• AirEvac ventilation: Integrates with Smith goggles and eyewear to encourage airflow and reduce lens fogging during mixed-intensity rides.
• Ionic+ lining: Uses sweat-activated odor control to keep the interior fresher during multi-hour outings.
• Adjustable visor and vents: Fifteen fixed vents and a three-position visor deliver consistent airflow and simple sun protection for variable trail conditions.

Who It's For

The SMITH Session is aimed at adult mountain bikers who want a modern trail helmet with proven impact technologies and good ventilation; it works well for riders who frequently use goggles or performance eyewear and need integration that reduces fog and improves comfort. Its 13 oz (Size M, MIPS) weight and low-bulk webbing make it attractive to cross-country riders and all-mountain cyclists seeking a lighter option that still meets CPSC and CE EN 1078 safety standards.

Riders who want extreme downhill-specific coverage or a very plush, heavily padded fit should look elsewhere, as this helmet favors breathable Koroyd structure and a streamlined profile over thick padding. Also, if a rider prefers a dial system with micro-adjustable vertical positioning beyond the VaporFit 270-degree wrap, there may be more adjustable alternatives.

Pros & Cons

Pros

• Excellent ventilation from 15 fixed vents combined with Koroyd structure for cooling on long rides.
• Integrated protection approach with MIPS and Koroyd for both rotational and energy-absorbing benefits.
• Clean fit and easy adjustment via the VaporFit dial, plus good eyewear/goggle integration with AirEvac.
• Lightweight at about 13 oz (Size M, MIPS) and low-bulk straps help reduce fatigue.

Cons

• Some riders report mixed comfort preferences and occasional slipperiness under certain conditions, so fit feel can be subjective.
• Not the most heavily padded or full-coverage option for aggressive downhill riders seeking extra shell bulk.

Specifications

Brand	SMITH
Protection Technology	Koroyd coverage + MIPS Brain Protection System
Fit System	VaporFit 270-degree dial adjustment
Venting	15 fixed vents with AirEvac integration
Weight	13oz / 370g (Size M, MIPS)
Features	Three-position visor, Ionic+ lining, single layer webbing
Certification	CPSC, CE EN 1078

Our Verdict

The SMITH Session MTB helmet is a strong value for mountain bikers who want a lightweight, well-ventilated helmet that pairs Koroyd energy absorption with MIPS rotational protection and reliable eyewear integration. It suits cross-country and all-mountain riders who favor breathability and a clean fit; those needing maximum padding or heavier downhill coverage should compare other models. Overall it delivers a compelling balance of protection, fit and ventilation for trail riding.

Frequently Asked Questions

Does this helmet work with goggles?
The AirEvac ventilation and the helmet shape are designed to integrate with Smith performance goggles and most performance eyewear for reduced fogging and secure storage.

Is the fit easy to adjust?
Yes, the VaporFit dial provides 270-degree adjustment that tightens the helmet around the head for a secure, even fit with one-handed micro-adjustment.

How heavy is the helmet?
The helmet weighs about 13oz / 370g in a size M when equipped with the MIPS system, making it a lightweight option for trail riding.