Best MTB Helmets · #7
A3
Troy Lee Designs
Reader rating
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Deep coverage with a dual-density EPS and a genuinely comfortable liner for long days.
Pros
- Deep, confidence-inspiring coverage for varied trail riding
- Exceptional all-day comfort with a secure, stable fit
- Dual-density EPS provides broad impact protection
- Highly adjustable visor with excellent goggle integration
- Robust construction for durability and resilience
Cons
- Not the lightest option for long, hot climbs
- Ventilation is good, but not best-in-class for extreme heat
- Bulkier profile compared to minimal trail helmets
Best uses
- Technical trail riding
- Enduro racing/riding
- All-mountain adventures
- Long days in the saddle
Specifications
- Coverage
- Deep Trail/Enduro
- Retention System
- 3-position height adjust
- Safety Features
- Dual-density EPS, MIPS
- Ventilation
- Adequate for most conditions
- Visor
- Adjustable, goggle-compatible
- Liner
- Washable, moisture-wicking
Pricing
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Best for
Technical trail riding, Enduro racing/riding, All-mountain adventures, Long days in the saddle
Where to buy the A3
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The Troy Lee Designs A3 helmet slots in as a solid, dependable choice for riders seeking comprehensive protection without an extreme weight penalty. This model is designed for a wide range of mountain biking, from technical trail rides to enduro, prioritizing deep cranial coverage. It integrates a dual-density EPS liner, a critical feature for managing impact forces across different energy levels, which contributes significantly to its reassuring feel on the head. Comfort, often an overlooked aspect, is a strong point here, making it easy to forget you're wearing it even after several hours in the saddle. What sets the A3 apart in a crowded market is its balanced approach to safety, ventilation, and user experience. It doesn't claim to be the lightest or the most aggressively ventilated, but it executes its core functions with a high degree of competence. Riders who value a secure, stable fit that minimizes distractions will appreciate its thoughtful internal padding and retention system. While perhaps not the flashiest option, its understated yet robust design speaks to a commitment to practical performance, holding its own against competitors that often demand a higher price point for similar features. It's a workhorse helmet, built for the realities of trail riding.
Who It's For
This helmet is genuinely for the rider who spends long days on varied terrain, prioritizing confident protection and all-day comfort. It’s not just for the weekend warrior but also suits those pushing harder on more technical trails, where a high level of impact absorption is paramount. If you frequently find yourself on descents where a fall could be significant, or if you prefer a helmet that feels substantial and secure, the A3 is a strong contender. It's less for the weight-weenie cross-country racer and more for the trail enthusiast or enduro rider who values peace of mind over marginal gram savings. It fits a broad spectrum of head shapes comfortably, which is a big plus for many.
Materials & Construction
The construction centers around a multi-component shell integrated with a dual-density EPS foam liner. This layering of foam densities is crucial; the softer layer handles lower-energy impacts, while the firmer layer addresses higher-energy forces. This thoughtful engineering means the helmet can effectively dissipate a broader range of impact types. The outer shell is robust, designed to take the usual knocks and scrapes of trail use without significant cosmetic compromise. Internally, the padding is strategically placed, removable, and washable – a practical feature that extends the helmet's lifespan and keeps it smelling fresh. The MIPS system is seamlessly integrated, ensuring rotational impact protection.
Real-World Performance
On the trail, the A3 performs exactly as intended: it disappears. The fit is snug but not constricting, thanks to the comfortable liner and the effective retention system that cradles the head rather than just clamping it. Ventilation is good, striking a balance between airflow and shell integrity; while not the airiest lid for scorching climbs, it manages heat effectively enough for most conditions. The adjustable visor is a standout, offering excellent range and staying put without rattling, even on rough sections. Goggle compatibility is well-executed, with ample space for strap placement and a good fit under the visor. It inspires confidence, allowing the rider to focus on the trail, not their head protection.
Weight & Packability
The A3 isn't a featherweight, but it also isn't a lead balloon. Its weight is commensurate with its deep coverage and robust construction. You'll notice it on your head briefly, then largely forget it's there due to the excellent balance and fit. For riders accustomed to open-face trail helmets, it won't feel unusually heavy. Packability isn't its strong suit, as the helmet's substantial shell means it doesn't compress or fold. It's a full-sized helmet designed to offer maximum protection, so expect it to occupy a standard amount of space in your gear bag or on your handlebars. This is a trade-off for the confidence it provides on challenging terrain.
Durability & Longevity
This helmet is built to last through seasons of hard riding, assuming it avoids major impacts. The outer shell material is resilient against minor abrasions, and the overall construction feels solid. The internal components, like the retention system and padding, are of high quality and show good resistance to wear and tear from sweat and repeated adjustments. While all helmets have a finite lifespan, especially after an impact, the A3 feels like it will hold up well to the rigors of regular use. The ability to remove and wash the liner significantly contributes to its potential longevity, preventing premature degradation from grime and sweat buildup.
How we chose
We started with a long list of best mtb helmets that people actually buy, cut anything that could not clear our baseline for durability and field performance, then ranked the 10 that were left against the same criteria. Rankings are editorial. No brand pays for placement, and affiliate links never move a pick up or down.
- Real-world durability
- How the material, stitching, or steel holds up after a season of hard use — not how it looks new.
- Performance in bad conditions
- Wind, rain, cold, and grit are the test. Anything that only works on a nice day gets marked down.
- Weight and packability
- Every ounce has to earn its place in the pack, but not at the cost of something that fails in the field.
- Ease of use
- Setup, adjustment, and maintenance with cold hands, in the dark, without the manual.
- Value at its price point
- Compared against the closest competitors in the same tier, not against cheaper gear in a different class.
- Repairability and support
- Field-fixable design, available parts, and a warranty the maker actually honors.
A3 — frequently asked questions
- Is the A3 worth it?
- We rank it #7 in Best MTB Helmets. Deep coverage with a dual-density EPS and a genuinely comfortable liner for long days.
- What is the A3 best for?
- Best for technical trail riding, enduro racing/riding, all-mountain adventures and long days in the saddle. Standouts: deep, confidence-inspiring coverage for varied trail riding and exceptional all-day comfort with a secure, stable fit.
- What are the downsides of the A3?
- Not the lightest option for long, hot climbs, Ventilation is good, but not best-in-class for extreme heat and Bulkier profile compared to minimal trail helmets.
- What are the key specs of the A3?
- Coverage: Deep Trail/Enduro · Retention System: 3-position height adjust · Safety Features: Dual-density EPS, MIPS · Ventilation: Adequate for most conditions · Visor: Adjustable, goggle-compatible
- Who It's For?
- This helmet is genuinely for the rider who spends long days on varied terrain, prioritizing confident protection and all-day comfort. It’s not just for the weekend warrior but also suits those pushing harder on more technical trails, where a high level of impact absorption is paramount.
- Materials & Construction — what should I know about the A3?
- The construction centers around a multi-component shell integrated with a dual-density EPS foam liner. This layering of foam densities is crucial; the softer layer handles lower-energy impacts, while the firmer layer addresses higher-energy forces.
Compare side by side
Put the A3 against any other pick on this list — specs, price, pros, cons and reader ratings.