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Troy Lee Designs D3 Carbon Fiber Helmet

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Item # TLD001F

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Item # TLD001F


You’ll find the Troy Lee Designs D3 Carbon Fiber Helmet on the heads of many of mountain biking’s greats, and it’s not exactly a mystery as to why. First, there’s TLD’s storied heritage, which alone would be enough to keep its helmets on the heads of the sport's elite. Then there’s the fact that it exceeds every relevant helmet safety standard. And finally, between TLD’s eye-catching graphics, and the stunning shell shape, it’s arguably the sweetest looking lid ever built. Whatever reason you pick, the result is the same — you’ll be wearing what just may be the ultimate full face helmet.

The D3 CF is made with Troy Lee's carbon fiber shell. Carbon fiber has become the dream material for helmets because of its light weight and incredible durability. This being the carbon version, it’s accented with titanium hardware for light weight, strength, and additional bling. The helmet comes with two visors, so you can pop a new one on in the event of a visor-smashing digger. TLD also threw in a custom helmet bag to protect the incredible paint jobs that the D3 sports.

Full incremental sizing, rather than a cheesy adjustment system, gives the D3 a completely custom feel. Dual-density shock pads provide luxurious comfort and unprecedented protection. Thanks to an intelligent design, the D3 exceeds CPSC 1203, CE EN 1077, CE EN 1078, ASTM F1952, and ASTM F2040 safety standards. In other words, you’re giving your brain the absolute best chance of walking away from harrowing crashes unscathed. Troy Lee's comfort liner is completely removable, washable, and replaceable, so you don't have to buy a new if the liner gets irreparably funky. The liner is also made with CoolMax and Dri-Lex moisture-wicking materials to keep your head dry and cool while you ride. And Troy Lee also equipped the D3 with quick-release cheek pads to make the helmet easier to remove in case of an emergency.

Troy Lee didn't stop at padding to make the D3 the most comfortable helmet on the market. The D3's ventilation system keeps the air flowing with an advanced intake/exhaust system. Twenty high-flow intake and exhaust ports, together with a new, deeper EPS channeling system provide cooling airflow through the helmet.

The Troy Lee Designs D3 Carbon Fiber Helmet comes in six sizes, from X-Small to XX-Large, and is available in the colors Finishline, Gwin Replica, Pinstripe II, and Speed.

  • Carbon fiber shell
  • Titanium hardware
  • Extra visor included
  • Full incremental sizing
  • Washable CoolMax and Dri-Lex liner
  • Twenty intake and exhaust ports

Tech Specs

Shell Material:
carbon fiber
Multiple Impact:
CPSC 1203, CE EN 1077, CE EN 1078, ASTM F1952, ASTM F2040
Recommended Use:
downhill, freeride, enduro
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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Here's what others have to say...


Amazing protection

  • Familiarity:I've put it through the wringer

I have hit the ground hard in many helmets, Fox, Six Six One, and Troy Lee. The Troy Lee is by far the most protective helmet I have ever laid my hands on. After hitting the ground hard with my head going first and breaking my collarbone I can say that the troy lee did its job and did it well, didn't even get a concussion or much of a head ache. Its hard to scratched. the visor is strong. And it is extremely comfortable and ventilates well (if you get a size and pads that fit you.) My only complaint is that the chin strap dose not slide easily, so you have to use your fingers to get it off. In response to other reviews, the padding is very thick, and the cheek pads need to be fitted for you. (they sell more than one size of cheek pads so you can find whats right for you)

Have owned the helmet for a year and a half.

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.

Your Brain Will Thank You.

  • Familiarity:I've put it through the wringer

There are a lot of helmets out there, and there are a lot of companies who claim that their helmet is the newest, bestest, baddest brain bucket, but who have a questionable history and can't quite explain why you should buy their helmet.

The D3 isn't one of those. The TLD D3 is trusted by the world's fastest racers for one reason: in that moment when your face is accelerating at an alarming rate towards an inevitable dirt rendezvous, the last thing you want to be questioning is whether or not your helmet is up to the impact. With a history based in the moto industry and quality bred through experience, TLD's D3 padding and construction goes above and beyond most helmets available on the market and has long been the standard to beat for one reason: your brain. While a lot of reviews might focus on the lightness as a benefit of carbon, I'm going to point out the impact absorption part; the most important feature of any helmet is force dispersion, and carbon dampens and absorbs extremely well. So well, in fact, that some studies have shown brain damage to be reduced by nearly half in comparisons to plastic or composite helmets. 50% reduction in force is pretty damn important when you're talking about delicate brain tissue, especially when you take into consideration all of the force an impact can exert on the brain.

I've happily used the D3 for four years and despite some massive hits that should have left me a vegetable, I'm still here, kicking and (semi) sane. Ultimately, that's what a helmet is supposed to do -- mitigate the bad decisions that may cost us the ultimate price. The D3 also has EMS-specific removable pads in the case that everything goes wrong and you need to be cared for by emergency personnel -- the padding is removable by two small tabs which make removing the helmet easy in an emergency without compromising the spinal cord or other injuries. That's how much TLD thought this helmet through. And sure, we could talk about breathability or lightness or cost or any number of other semantic details, but when it comes to your life, does any of that really matter if your brain no longer works?

The D3 isn't just for the world's fastest racers -- it's for those who take risks and want to live to ride another day.

Your Brain Will Thank You.


    I unfortunately had to return the D3 Pinstripe. First I noticed that the cheek pads seemed a little too loose. Secondly, the padding around the back and back sides is too thin. When pressure was applied in these areas, it hurt. I didn't want to risk taking a hit in these areas with this helmet so it was returned. Other than the previous mentioned issues the D3 did fit well. The Giro Cipher though, is a much better helmet in my opinion.