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Troy Lee Designs A2 MIPS Helmet
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Item # TLD00VY

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Item # TLD00VY


Hit the trails.

Full-faced helmets have their place on rowdy lift laps and jumps, but some days aren't as extreme, so it's good to have a Troy Lee Designs A2 MIPS Helmet waiting in the wings. Building on a well-earned reputation for hard-hitting motocross and gravity protection, the A2 transitions protection to lighter duty trails with massive venting, ample coverage, and MIPS technology to keep you cool under duress.

With 25% more ventilation than that found on TLD's venerable A1 helmet, the A2 MIPS promotes cooling airflow and encourages constant air movement across your dome. A removable, soft and plushy X-Static Pure Silver liner sits comfortably against your head, fending off the stink produced by bacteria and drying quickly to keep you cool. Not to ignore fit, the A2 MIPS helmet incorporates a three-position adjustable retention system for a custom, easily dialed fit.

  • A lightweight helmet built for all-day trails
  • MIPS technology reduces rotational force in certain crashes
  • EPS and EPP foam mix absorbs low and high speed impact
  • Extended coverage at back and temples increases protection area
  • Large vents promote cooling airflow
  • Highly adjustable retention system dials in the fit
  • Visor fends off branches and glaring sun

Tech Specs

Impact Foam:
EPP and EPS co-molded
large vents
Fit Adjustment:
Rear Stabilizer Fit System
CPSC 1203, CE EN 1078
Claimed Weight:
[size M/L] 350g
Recommended Use:
mountain bike
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.

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Unanswered Question

Hi there, my head circumference is about 23.25". What size would you recommend for this helmet?

I'm a size 22 and have a hard time getting a good fit, usually get a medium and have to tighten it all the way down. Would the XS/SM in the A2 be the correct size to go with? Thanks

Hey William,

Great question as the size ranges for Troy Lee are different than a lot of other brands. If you measure 22 inches, I would do the XS/S and that should fit just fine.

Great helmet

    This is far and away the best helmet I’ve ever worn in my 30 years of mtn biking. The fit is fantastic, very comfortable and light yet you just feel totally protected. I bought a second one to have where I spend about a week a month and have my old bike.

    Put a lid on it

      Very comfortable and stylish helmet. My first MIPS experience and it seems to have a great fit. I got this helmet to provide more coverage for enduro racing.

      Put a lid on it


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

      I was recently inspired to invest in a better helmet after the death of a mountain biker on one of our local trails... It didn't take long for me to decide on this Troy Lee helmet when shopping around. This model came in XL--perfect for my fat head. .. As I was unpacking, my first impression was that this helmet has been meticulously engineered and designed for safety. It looked impressive just sitting in its box! Today was the first day that I wore it on a ride, and I can say without a doubt that this is the best mountain biking helmet I have ever owned. The difference between a $135 helmet (this one) and a $65 dollar helmet is truly insane. What you get for $135 will not only possibly save your life one day, but also make you feel good that you are doing the best you can to protect your precious melon! Buy one!

      Great Helmet

        Like most TLD products, this helmut has been great. The fit is perfect and the ventilation is amazing.

        Great protection but some limitations.

        • Familiarity: I've put it through the wringer
        • Fit: True to size
        • Size Bought: M/L

        Bought this after my re-entry into mountain biking. The fit is great and the protection I can attest to - crashed pretty heavily and the helmet was "dented", but protected my noggin' as it should have. It is comfortable and light and vents fairly well in the hot New Mexico climate. The only reason I deducted a star is that the helmet does not have a lot of clearance for glasses. I find that after some time descending a rocky trail that the helmet starts to push down on my glasses. I'm constantly having to readjust the helmet and glasses which gets pretty gnarly in technical descents. If you don't wear glasses this is a non-issue, but if you do, beware. The helmet fits great when you first try it on but take it out for a ride before you plunk down the cash.

        Do you mean prescription glasses or sun glasses? I always wear some sort of eyewear for protection and can't have the constant fiddling with helmet and glasses as you describe.

        Troy Lee Designs A2 MIPS Helmet

        • Familiarity: I've used it several times

        Loved the look of this helmet when I first saw it! I did a bunch of research before I would even consider spending this kind of dough on a helmet. Arrival day, was super stoked on the looks and the way it fit my head. Even more stoke was present when I took it for the first ride. The helmet seemed super light and was like air conditioning for my melon. I barely noticed the helmet on my head while riding. All the features of the helmet are designed well and work for what they are intended. I was very hesitant about spending this kind on money on the helmet but super glad I pulled the trigger in the end. Hopefully I never test the durability during a crash to see how the shell and the MIPS performs. I'm a father of 3 on a budget and don't regret buying this at all. Definitely the best helmet I've worn to date in my 23 years of mtn biking.

        TLD A2 Helmet

        • Familiarity: I've put it through the wringer

        The new A2 is nothing short of excellent!! The redesign from the A1 gives it a more modern look as well as greatly improved ventilation. MIPS comes in every model now and I've fortunately/unfortunately experienced first-hand how well it works. The new fit feels amazing as well; it basically hugs your head and doesn't slide around.

        Avg. ride time: 0m per week
        • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

        New helmet, new cool

        • Familiarity: I've used it several times

        Bought this as a replacement for a POC Trabec Race MIPS helmet that took a nasty beating (and held up great! - would have replaced it but couldn't get the color/size I needed). So I spoke to the bike merchandising team and they suggested I try this one, and I have been really happy with it. It's comfortable and cool (especially important here during Utah summers) and looks pretty awesome. I haven't taken any hits in it yet (knock on wood!) but with the density and MIPS, i'm confident my brain will be protected!

        Excellent Brain Protection

        • Familiarity: I've put it through the wringer

        Decided to purchase this helmet after reading many reviews. Wanted a helmet that had the most up to date technology for protecting my brain. Was between the poc tectal and the A2. After trying both on, went with the tld cause it just felt better. No pressure points or rubbing. Lightweight. Adjustable inside to make sure helmet is nice and snug. Would definitely recommend to a friend for cross country style riding. highly breathable with lots of circulation.

        Bitchin Trail Helmet!

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

        I've been riding in the Smith Forefront for the last two seasons (GREAT helmet BTW) but I decided it was time to give TLD a shot. This helmet is super light, and has ALL THE VENTS. It also features tons of adjustment options to dial in the fit. I wear a 7 3/8 baseball hat, and the M/L fits me well.

        Best MIPS MTB helmet out there

        • Familiarity: I've put it through the wringer

        After using the POC tectal race all of last season, I decided it was time to give TLD's new A2 a shot this season.... I am so stoked I did!

        I don't think I have an oddly shaped head, but after trying out multiple helmets and sizes (including the Smith Forefront MIPS, this helmet and the Giro Montaro MIPS) - the A2 was the clear winner.

        The A2 boasts a stellar look and style to it - not to mention they have some sick color ways to choose from. This lid also has the latest helmet technology, MIPS, which stands for Multi-Directional Impact Protection System which keeps your head and neck safer than a standard helmet. The A2 also is fairly light, has great ventilation and one of the more solid adjustable systems in the back of the helmet.

        Give me a shout if you are wondering what colors look best in person, what size to go with or other TLD/mountain biking gear is out there!

        Best MIPS MTB helmet out there

        Debating on the 50/50 white red or the all white with pinstripes. What do u recommend ?

        great lid

        • Familiarity: I've used it several times

        been riding in the A1 for years and when this came out it was a no brainer. More vents, lighter and MIPS makes for 1 great helmet.

        Don't Even Realize You Have It On

        • Familiarity: I've put it through the wringer

        Wow! This is what other bike helmets aspire to be. Countless rides with the A2 decoy and I can't wait to wear it again. This helmet is so lightweight and breathable which makes it nice as the temp starts to heat up. The added protection of the MIPS membrane gives me a higher self if confidence when going all out down the hill. Well done all around!! And might I add the employees at backcountry are super awesome and made it stupid easy to purchase. Keep up the good work!!

        Excellent Helmet

        • Familiarity: I've used it several times

        I have an A1 non Mips, it's probably the most comfortable helmet I have ever worn. It has one major flaw. It's HOT as Hell. And pretty much not wearable in the humid southeastern US. Fortunately the new A2 mips solves this problem. The vents are much larger and channel alot of airflow through the helmet. You can actually hear the air speed through the vents at high speeds. Almost like a venturi. The construction and materials are top notch. Very impressed with this Lid. I wore a M/L in the A1 and the A2 fits pretty similar. Plus it looks killer!

        Does the A2 seem a bit larger than the A1? I have read once or twice that you can size down on the A2 if you had a little room in the A1.

        Stellar Protection

        • Familiarity: I've put it through the wringer

        The new A2 is a fantastic progression from the A1. For me it fit better (I have a roundish profile head) and the vents are much nicer. It fits better with my Oakley sunglasses and the added protection from the MIPS helps keep you safe. The rear dial allows easy on the fly adjustments. The large visor keeps the sun out of your eyes and the aluminum visor bolts are such a nice touch to finish off this stellar looking helmet. Well done TLD!

        Looks good, fits well

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

        "Good looking helmet (mips is a plus) and fits like a glove. Ventilation is great. Lots of adjustments to dial down on the fit."

        Great fitting helmet

        • Familiarity: I've used it several times

        Helmet fits great with nice large vents. The opening around the ear accommodates sunglasses which has been an issue for me with other brands. Also dig the dial on the back to tighten it up.