Big berms, rock gardens or flowy rollers. No matter the trail, get after it with confidence in the Smith Engage mountain bike helmet. Zonal Koroyd™ complements MIPS® for energy-absorbing impact protection in the event of a crash. A dial adjustable fit and extended back coverage provide a locked-in feel. On hot days or exposed climbs, 20 fixed vents and our AirEvac™ ventilation system keep you cool and comfortable. Channels on the front make it easy to stow eyewear and a two-position visor rotates up for on-the-go goggle storage.

Protection

Lightweight in-mold construction, Zonal Koroyd® coverage for lightweight, energy-absorbing and ventilated impact protection
MIPS® Brain Protection System reduces rotational forces caused by angled impacts to the head
CPSC and CE EN 1078 certified

Fit / Integration

Adjustable dial fit system for a customized fit
Designed for ultimate integration with Smith performance eyewear for maximum comfort, venting and storage convenience
AirEvac™ ventilation system integrates with Smith eyewear for fog-free lenses

Key Features:

21 fixed vents for consistent airflow
Performance comfort lining
Lightweight, low-bulk single layer webbing
Two position adjustable visor
Weight (Size M, MIPS®): 12 oz / 350 g

Occasionally, without notice, manufacturers change product design and/or specifications.

Smith Helmet Size Guide

Use the below chart and guide to find the correct size Smith helmet for you.

	Head circumference (cm)
S	51 - 55
M	55 - 59
L	59 - 63
XL	63 - 67

How to measure

To find the circumference of your head, place a tape measure in the centre of your forehead, wrap it around above your ears and around the back of your head. If there's a slight difference between two different sizes, always go for the tighter size.

Once you know the circumference of your head, see the available sizes shown on the product and select the appropriate one.

The majority of cycling helmets have some form of adjustment for size, usually in the form of a ratchet adjuster to tighten or loosen the straps, some helmets will also come with different thickness pads to further customise the fit.

Read our clothing size guide for more information on sizing.

2025 Gravel Bikes

Smith Optics Engage Mips MTB Mountain Cycling Helmet

Smith Helmet Size Guide

How to measure

Smith Optics Engage Mips MTB Mountain Cycling Helmet