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6D Helmets ATB-1T Helmet

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Item # SDH000X

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The evolution of safety.

6D Helmets has been doing cool things with lids on the moto side of things for a while, but now it's jumping into the mountain bike realm with the all-new ATB-1T Helmet and its revolutionary Omni-Directional Suspension (ODS) Technology. Two and a half years in the making, this helmet breaks new ground in force reduction for increased safety out on the trail.

ODS, in short, consists of two layers of EPS foam sandwiched around a series of dampers to absorb impact and reduce linear and angular accelerations. The outer layer is a higher density EPS in-molded with a durable polycarbonate shell to direct impacts, while the inner layer is a lower density EPS that provides quicker compression versus lower impact forces.

These layers are joined by 27 elastic isolation dampers that allow movement across both compressive and shearing planes of motion in the event of a crash, with a compressive spring rate to mitigate accelerations. Think of the system as a ball and socket joint, in which the inner shell is able to shift and rotate across multiple planes to reduce impact force across the full range of strike angles. This is a big deal when you're staring down the barrel of a gnarly run and thinking about the big line.

Even with all that safety packed in, the ATB-1T still looks like a rockin' trail helmet, so you'll stick out for your style instead of a noticeably strange head topper. 6D also pays attention to smaller, less obvious details to make wearing this helmet a comfortable experience. Large air vents promote cooling airflow for ease of use on even the warmest rides, while a removable and washable liner sits softly against your skin to wick away sweat and keep your lenses clear. An adjustable fit system lets you dial in the perfect fit in a snap, and a Fidlock buckle system connects the chin straps using magnets instead of clips for secure, user-friendly, one-handed operation.

Tech Specs

Shell Material:
Impact Foam:
15 vents
Fit Adjustment:
Adjustable Fitment System
yes, adjustable/removable
Full Face:
CPSC 16 CFR 1203, EN 1078
Recommended Use:
mountain bike
Manufacturer Warranty:
1 year limited

Size Chart

6D Helmets

Head Circumference 20 - 21.75in
(51 - 55cm)
21.75 - 22.25in
(55 - 59cm)
23.25 - 24.75in
(59 - 63cm)
How to Measure:
Measure around your head where your hat would fit comfortably.

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Functional Protection

  • Familiarity: I've put it through the wringer

First off I will start by saying this helmet has the easiest to use strap system of any helmet I've tried. It snaps together eagerly and has a positive connection for a secure fit. Sure the helmet is a little heavy but it also offers some of the best protection of any helmet on the market. The ODS system offers excellent protection from impacts and twisting forces and helps to reduce injuries in the event of a crash. The only real drawback to this design is it doesn't vent quite as well as some other helmets and it's a little heavy. However, I don't notice the weight once it is on and I'll take the extra protection on offer from the ODS system.

6D Helmet

  • Familiarity: I've put it through the wringer

I use the helmet for cross country mountain bike riding. Before purchasing the helmet and after reading some reviews, I was concerned about the weight and size. I have found that both these issues are not a concern. I don't even notice the weight when I am riding. The helmet gives me solace knowing that it is one of the most technically advanced helmets around.

Great Helmet !

  • Familiarity: I've used it several times
  • Fit: True to size

Well built and I love the way the strap connects .

Avg. ride time: 26m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Fantastic helmet!

  • Familiarity: I've put it through the wringer

There's been an increasing demand for helmets equipped with concussion reduction technology, and there has historically been one option for that technology – MIPS. MIPS seemingly took the bicycle helmet industry by storm a few years back, but we now have a new player producing some amazing helmets. 6D has been manufacturing helmets used in motocross and BMX for a while, and has finally ventured into mountain bike with the ATB-1T. This helmet uses a system they are calling ODS, or Omni-Directional Suspension. It's similar to MIPS, but it's executed a bit differently. The system basically creates a ball-in-socket from the inner and outer shell, with 27 elastic isolation dampers connecting the two EPS Foam layers. The benefit is that it cuts down on rotational forces like MIPS, but unlike MIPS, I've never noticed any noise or rattling from the ATB-1T.

One of the first things you notice about the helmet is the weight. It is heavier than my Bell Super 2 MIPS that I had been riding prior. However, once the helmet is on your head, the weight is less noticeable, mostly due to a fantastic retention system. The buckle is a nice touch as well. It's a magnetic system called Fidlock that automatically locks together, and allows for quick, one-handed connection of the buckle.

I find that a warm day is best when getting a feel for a new helmet, since it allows one to experience the ventilation and wicking performance. Luckily I was able to give the helmet a solid shake down in approximately 75-degree weather on exposed, sunny trails. The padding does a good job of wicking the sweat away from the eyes, and while it has fewer vents than my Bell Super, my head didn't feel any warmer in the ATB-1T. The added weight of the helmet disappeared as I was riding, whether I was climbing or descending.

Comparing this helmet to the Super 2, the difference is definitely noticeable. Weight aside, the 6D is a larger helmet, overall. I currently own a large Super 2, and the 6D is a M/L, which puts me at the top end of the size range. I wouldn't want to size up to the XL/XXL due to the increased size of the shell on the 6D.

Although I appreciate the added protection, one of my biggest complaints about MIPS helmets has been the noise. Noise is not something that one usually thinks about when it comes to a helmet, but after riding a POC Trabec Race MIPS and the Super MIPS, I have found that the plastic MIPS layer can rub against the inside of the helmet, which creates a distracting squeak while riding. The 6D has not developed any noise in the few weeks I have been riding it, and is far more comfortable on my head. After spending the early season in the ATB-1T, my take is that this helmet would be a great option for someone looking for a comfortable, well-ventilated helmet that provides maximum protection when you're on the trail.

Fantastic helmet!

Perry, good info there. Question for you...would you say this helmet is good for a rounder head profile? Bell's seem to be about the only helmet brand I can wear comfortably, due to my (what must be) unusually round head. Since you mention also having a Bell, was hoping maybe this was also more for a round profile. Thanks!

Great Helmet

  • Familiarity: I've used it several times

Fits perfectly, air flow is good. Everything about this helmet is top notch. Money well spent