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Troy Lee Designs A-1 Helmet

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Item # TLD0273

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Item # TLD0273

A masterpiece of versatility.

It's been a while since the folks at Troy Lee Designs designed and built an all-mountain helmet. As is always the case with TLD, they came out with a bang. The A-1 Helmet is a definite departure from the Troy Lee norm, but it's built with TLD's legendary attention to detail and durability.

The first thing you notice about the A-1 is its sculpted, almost artistic shape. More than simple aesthetics, the shape of the A-1 increases air flow through the helmet to keep your head dry and cool. This is especially important when you're grinding out a punishing climb in the heat of the summer. Airflow is directed through 16 cooling vents–6 intake, 4 multi-directional, and 6 output vents. The shape of the visor, which can be adjusted a full inch on the fly, was also dictated by airflow. Moisture management is assisted by a nanowick synthetic liner with CoolMax panels.

The durable polycarbonate shell surrounds single-impact EPS foam for light weight and proven protection. The visor is made with high-impact polypropylene for additional eye protection. Troy Lee used super-durable anodized aluminum hardware throughout the A-1's construction. The A-1's customizable fit is taken care of by triple-position stabilizer baskets and a multi-position cam-lock adjustable stabilizer with +/- 20mm of movement.

The Troy Lee Designs A-1 Helmet comes in three sizes: XS/S, M/L, and XL/XXL. It is available in Gold and Black.

  • Multi-position cams for optimal fit
  • Fuller-coverage helmet
  • 16 big vents for airflow

Tech Specs

Shell Material:
Impact Foam:
EPS (foam)
16 vents
Fit Adjustment:
cam-lock stabilizer
Recommended Use:
all mountain, cross country
Manufacturer Warranty:
1 year

Size chart

Troy Lee Designs

Bike Helmets
Head Circumference 21.3 - 22in
(54 - 56cm)
22.4 - 23.2in
(57 - 59cm)
22.6 - 24.8in
(60 - 62cm)
Hat Size 6 3/4 - 7 7 1/8 - 7 3/8 7 1/2 - 7 7/8
Head Circumference 20.5 - 20.9in
(52 - 53cm)
21.3 - 21.7in
(54 - 55cm)
22 - 22.4in
(56 - 57cm)
22.8 - 23.2in
(58 - 59cm)
23.6 - 24.4in
(60 - 62cm)
24.8 - 25.6in
(63 - 65cm)
US Hat Size 6 1/2 - 6 5/8 6 3/4 - 6 7/8 7 - 7 1/8 7 1/4 - 7 3/8 7 1/2 - 7 3/4 7 7/8 - 8 1/8
Head Circumference 21 - 22in
(53 - 55cm)
22.4 - 23.3in
(56 - 59cm)
23.7 - 24.5in
(60 - 62cm)
US Hat Size 6 1/2 - 6 7/8 7 - 7 3/8 7 1/2 - 7 3/4
How to Measure:
With a tape measure, measure the widest point of your head, approximately 1 inch above your eyebrows.

Reviews & Community


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Here's what others have to say...


see Craig L's Review

  • Familiarity:I gave it as a gift but have feedback to share
  • Fit:True to size

His review says all you need to know about this helmet. It saved his brain. That dent in his helmet is the result of a VERY hard crash at high speed (I was there). The TLD A1 was up to the task leaving his brain virtually damage free.



  • Gender:Male
  • Familiarity:I've put it through the wringer
  • Fit:True to size

I would like to thank Mr Troy Lee for saving my ass (head). Seriously though, helmet is extraordinarily comfortable and lightweight to boot. I highly recommend this product to all members of the #endurobro(ad) crowd.


Not Rocket Red ... more orange

  • Familiarity:I returned this product before using it

This is a great helmet, fits me really well and I'm sure I'll get plenty of use from it ... but it's definitely not the red I thought I was getting. So much more orange than red. The chin strap is almost fluorescent orange. It's going back for a different color.


The best hemet, really

  • Familiarity:I've used it once or twice and have initial impressions

I seem to have a hard time finding helmets that fit my head. I'm either between sizes, or my head just doesn't fit the shape quite right. I try on helmets every time I go to a bike shop just in case I find the one that feels good. They never do.

I thought I'd try the A1 after reading nothing but glowing reviews, all of which seem to praise its fit and comfort. Amazingly, everyone is right; this is by far the best fitting, most comfortable, and highest quality mountain bike helmet I've ever worn. I've only used it twice on singletrack so far, but that's enough for me to know that this one is the new benchmark.

The shape fits my head perfectly, which is amazing because it seems to fit everyone's heads perfectly. The padding really is better than that offered by competitors. Usually, there's a thin amount of padding at only the points where the helmet makes the most contact with your head, usually at the forehead and running up the top . The A1 covers every point of potential contact, and with a pad that's higher quality and more plush than any I've seen elsewhere. After three hours on the trail, I felt no pressure points, no hot spots, and no need to adjust or remove it.

It also doesn't flop around or shift while riding over rough sections. It just never moved. The dial in the back didn't back off after hours of riding, either. Once I put it on and had it how I wanted it, that's where it stayed until I took it off.

It also looks awesome, but you don't need a review to tell you that.

If you're reading this, you probably want the A1 already. I would recommend you forget about the price and try it. It's the most important piece of gear you're going to use, so it's worth a little extra money. If it fits like it seems to fit everyone, you'll very quickly forget about the cost and realize that every other helmet falls in a separate category. I was a skeptic, but if I crack this one tomorrow on the trail, I'll throw down the money for another one without hesitation.


Awesome helmet!

  • Gender:Female
  • Familiarity:I've put it through the wringer

I bought this helmet (Orange) a few months ago so I've used it enough (1-4 times a week) to give a review.
This is the most comfortable helmet I've ever owned. It fits my head shape perfectly (thanks to the nice adjusting system inside the helmet). It's light and I like the extra coverage on the back of the head. This summer was hot (high 80s - 90s ...... hot for Seattle area, WA:) and the helmet ventilated well.

On top of it all the helmet looks great!

Awesome helmet!

SO comfortable

  • Familiarity:I've used it several times

I swear this is so comfortable, compared to other helmets I've tried. The airflow is great- my head feels fine and isnt sore at the end of long rides. The straps are easy to adjust to be safest, and I love how much of the back of my noggin is protected.

SO comfortable

Best helmet I've worn

  • Familiarity:I've put it through the wringer

This is an awesome helmet! The mold they use fits my oval head perfectly. It's light, no complaints about the strap adjustment, and the airflow is pretty darn good. Best helmet I've worn


Babe Magnet

  • Familiarity:I've put it through the wringer

Comfortable, light weight, well vented, stylin'.

The Best/Most comfortable helmet out.

I've tried a lot of different helmets but will never stray away from the A1. It's by far the most comfortable helmet I've owned with it's deep sunken fit and it's stylish look why look anywhere else.

The Best/Most comfortable helmet out.
Avg. ride time: 23m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Great Helmet

  • Familiarity:I've put it through the wringer

The A1 is one of the industry-leading helmets for a reason: maximum venting, comfort, affordability and style, all with a pretty sweet selection of colors and sizing.

I would say that the single drawback to the helmet would be the sweat management -- I've never had a helmet drip sweat down my forehead and directly into my eyes/glasses area like the A1, but it's such a minor flaw that the awesomeness of the helmet is barely diminished. Removeable pads make it easy (really easy!) to keep clean, dial-adjustable sizing makes it a perfect fit for any head shape, and clean, open styling makes you look good, even if you have a weird face (like myself). Some helmets make me look and feel a little like Toadstool from Mario Brothers, but the A1 keeps it low profile. The front brim is a lifesaver on sun-facing rides, and the helmet is so comfortable that I rarely bother taking it off on hike-a-bike sections or between shuttle laps.

Great Helmet

Best bike helmet you could want

    This is the most comfortable bike helmet I have ever worn! It has thick, non obtrusive padding with lots of adjustability. It's also light, and is aesthetically pleasing. What more can you ask for?


    None Better

    • Familiarity:I've used it once or twice and have initial impressions

    I have owned a number of bike helmets having used one for 25 years or so. My current road helmet is a very nice Specialized and my previous MTB helmet was the same. I needed to replace it after I cracked it in an accident (did its job) so I ordered a well reviewed helmet, which was unfortunately painful to wear. I had read reviews of the Troy Lee helmet and one said "Don't put it on unless you are willing to pay the high price." I decided to try one. The review was right. I have never seen such a well made, well fitting helmet. The comfort and fit is well beyond any helmet I have ever worn. My head and comfort is worth the price. I can't see ever buying anything other than a Troy Lee.

    I have a 22 inch/57cm head should I get a small or a medium?

    Responded on

    Hey Tea! Thanks for your question.

    Since you are right in-between sizes I would recommend going with a M/L size since this helmet has multiple adjustments to make it fit just right on your head.

    Feel free to chat or call one of our expert gearheads for any other questions.

    Wife and kids got me the A-1 for Father's Day. They ordered the xl/xxl and my head seems to be swimming in it. My head measures an all most perfect 23". Should I return it for a M/L

    Responded on

    Todd, I would definitely try out the M/L seems like a better fit for you!

    Feel free to hit me up at or 801-736-6398.


    Incredible fit!

    • Familiarity:I've used it once or twice and have initial impressions

    I can hardly believe how comfortable this helmet is, WOW. The second I placed it on my head I realized why it has such rave reviews. My head measures exactly 59 cm and the M/L is perfect, I'm not even at the max range for size adjustment. Highly recommended.

    love this helmet. does this A1 matte version come with the protective/storage bag like the other troy lee helmets?

    Responded on

    Hi Tahnee,

    The Drone color options for $139 do not include a helmet bag, whereas the more expensive versions include it.


    Fit is awesome!

    • Familiarity:I've used it once or twice and have initial impressions

    Get it, your search is over.

    Well Ventilated

    Good ventilation. My last helmet was a Bell Super and the Troy Lee is not nearly as hot while climbing. The white on the visor and helmet do not completely match up so if you are uptight about true color match you may look elsewhere.

    Well Ventilated

    Visor Hardware

    Nice finishing touch with the anodized visor screws.

    Visor Hardware

    Good Fit, Great Looks

    • Familiarity:I've put it through the wringer

    This helmet fits fantastic for my head (roundish profile). It is comfortable and vents well. The strap system is easy to adjust and the chin strap is looped at the end so you don't have two tails dangling in the wind. The anodized visor bolts are a nice finishing touch. As a bonus Oakley Jawbone glasses fit in the vents so you can post up your glasses when climbing. One minor detail is that the white visor does not completely match the white on the helmet.

    Good Fit, Great Looks