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Troy Lee Designs
A3 Mips Helmet

5 out of 5 stars
7 Reviews
$149.99 - $249.99
Up to 40% off


Size Chart


Why We Like The A3 MIPS Helmet

Even if you know the twists and turns of the trail like the back of your hand, your noggin still deserves reliable protection against unexpected falls and impacts. To cover your cranium for those all-mountain adventures, throw on the Troy Lee Designs A3 MIPS Helmet. Its polycarbonate shell is designed to act as the initial barrier when charging trails, and underlying EPS foam absorbs impact through every fall. The A3 offers additional coverage along the temples and base of your head than its smaller sibling, the A2, but doesn't go overboard with chin bars that are better-suited for the bike park. MIPS technology repositions the helmet to soak up angled impacts, and a ventilated shell keeps you cool on hot summer rides. To protect your eyes from debris and glare, the A3 employs a three-position adjustable visor that our riders applaud for its ability to break cleanly from the helmet through a fall, reducing impact forces if you don't happen to stick the landing.


  • A ventilated all-mountain helmet for confident control in the saddle
  • Rugged in-mold construction absorbs blows and impacts
  • Ventilated shell boosts airflow as your ride heats up
  • Positioned foam wicks sweat to enhance comfort and fight odor
  • Additional coverage along the temples and base increases protection
  • Retention fit system dials in the perfect, customized fit
  • Adjustable visor shields against dirt, debris, and glare
  • Item #TLDY0H8
enduro, trail
Audio Compatible
Complies with U.S. CPSC Safety Standard for Bicycle Helmets for Persons Age 5 and Older, CE EN 1078, AS NZ 2063: 2020
Fit Adjustment
rear-stabilizer fit system
16 vents
Manufacturer Warranty
1 year
Claimed Weight
13.2oz (375g)
Shell Material

Overall Rating

5 based on 7 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 0 reviews
5 Stars - 7 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


Selecting an option will reload the available reviews on the page
5 out of 5 stars

September 30, 2023

Great for a difficult head

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

As an Asian, I have never found helmets that fit until I found Troy Lee Designs. My first helmet was a full-face and it fit really well. Same goes for this helmet. The magnetic chin strap buckle is easy to use.

D L43

Originally reviewed on Backcountry.com

5 out of 5 stars

July 11, 2023

Great half shell

I've used it several times
Size Bought:
5' 9"

Got this as a replacement helmet after a crash, and I am very happy with it. As someone who is between a medium and large helmet the M/L is perfect, I really like that it is lower profile than my old L Smith helmet while providing more coverage. I was a bit worried because other reviewers complained about their riding glasses not fitting comfortably but I have had none of those issues. In fact this is the most comfortable helmet I've ever worn including how the glasses stems sit, there is ample room while the helmet still provides great temple coverage. Next time I replace a helmet I will be coming back to the A3.

Pete W
5 out of 5 stars

June 1, 2023

Best helmet for heavy/extreme sweating.

I've used it several times
Size Bought:
5' 11"

This helmet is amazing. It fits so well and is so comfortable. It has MIPS. It has the magnetic strap. It has an adjustable visor. All not too unusual. Then you get to the liner. The front of the helmet has like a gasket, a squeegee like silicone or rubber part that sits against your forehead. In all my years of sweating profusely I have never found anything that actually prevents sweat getting into my eyes. Until now. This doohickey actually works. I would say it prevents about 80% of my shower-like, profuse sweat from getting into my face. It’s a game-changer.

Todd H
5 out of 5 stars

October 12, 2022

Best Helmet I Ever Used

I've used it several times

This is the best helmet I have ever worn. It is comfortable, cool, highly adjustable, easy to rinse after a ride, and based on reviews, very protect that that whole brain thing. I really like that way it channels forehead sweat away from my face. Oh, and it is great looking. This is the only helmet for which I got paid a compliment by another rider. Obviously a case of helmet envy.

Michael L

Originally reviewed on Backcountry.com

5 out of 5 stars

June 23, 2021

Decent helmet, exceeds expectations

I've put it through the wringer

My first TLD helmet, coming from Giro and Bell helmets I've been using for the last decade. I am pleasantly surprised how comfortable this helmet is. It feels like the helmet is wrapped around the head. I really appreciate how design of this helmet addresses little things, like magnetic buckle (super convenient) or piece of foam over the eyes area to keep sweat away. I do, however, have mixed feelings about that fin on the back of the helmet. What's the point of that thing? Does it even have a purpose? Looks like a weird little fantasy of a designer who spent all night watching "Star Trek". Overall, absolutely awesome product.

Max S

Originally reviewed on Backcountry.com

5 out of 5 stars

May 24, 2021

Insanely good quality!

I've used it several times

I purchased this helmet to replace my Giro Manifest Spherical helmet. Really good quality overall. The extra padding included is a nice value-added benefit that I haven't seen with other helmet manufacturers. I was on the max size for a small so I when a size up to M/L. There's definitely a size gap between XS/S and M/L but there's a lot of adjustments you can make that help get a proper fit like the extra thicker padding. I've only had it a couple of months but so far I'm happy with this one.

Josh V

Originally reviewed on Backcountry.com

5 out of 5 stars

March 20, 2021

Love at First Ride

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

Initial impressions of course, but after one ride in the A3 MIPS helmet, I'm a big fan. I once tried on a TLD A1 and instantly was uncomfortable, so I had my hesitations trying out the A3 MIPS helmet. Pulled it out of the box, threw it on, and was blown away at how comfortable it is and how well it fits my head. The adjustable boa system and ability to move the rear stabilizer fit system (the plastic that cradles the back of your head) up and down allows you to find that perfect fit. I personally wish it were halfway between the lowest two notches, but the middle does just fine. The ventilation is next level as well. The lightweight helmet breathes incredibly well on the way up, and for someone that overheats easily, that is clutch. The adjustable visor uses magnets, so it's easy to adjust, but stays in place even on rowdy sections of trail. Troy Lee Designs absolutely crushed it with the A3 MIPS helmet. A stylish, yet incredibly functional design leaves you looking great while being protected. Oh and the magnetic buckle is easy to do and undo with one hand, yet stays locked on the ride with zero concern. Sizing is on par with Smith and POC helmets as well. Easy to slide your sunglasses into the front of the helmet for storage as well.

John O

Originally reviewed on Backcountry.com