Review: The Leatt DBX 3.5, An Affordable Mountain Bike Neck Brace

The Leatt DBX 3.5 neck brace is an affordable piece of protective equipment for mountain bikers to consider.

Photo by Matt Miller.

It might seem like a stretch to call a $250 piece of protective equipment that most people won’t wear every time they ride “affordable.” Then again, consider the ultimate price of a spinal cord injury.

Paul Basagoitia is still recovering from a traumatic spinal cord injury and paralysis after a crash at Red Bull Rampage in 2015 that fractured his T12 vertebra. Although the T12 is lower down in the spine than what a neck brace is intended to protect, a spinal cord injury can happen anywhere up or down the spine, and often happens in the cervical vertebrae.

“Arguably the most significant injuries in motorcycle and other extreme sports occur in the cervical spine (neck) region. Injuries in this area may often cause paralysis or even death,” a sentence reads in an official Leatt white paper.

The most common cervical spine injuries occur in the upper vertebrae near the skull and are caused by whiplash, when the head is forced into backward, hyper-extension.

This is where a neck brace helps. How does Leatt know that it helps? For starters, they put a “cervical spine protection device” on an anthropomorphic dummy and sent it into a wall at 70 Gs of simulated force, along with other tests.

Leatt’s testing shows significant reduction in different bends of the head and neck upon impact. Forces on the cervical and thoracic spine were reduced, as were brain injury associated dynamics. Clavicle fractures were not increased by wearing the brace either, thanks to the soft padding and “collarbone relief.”

Forces on the thoracic spine were also reduced, since forces are often transferred from the cervical spine down toward the thoracic spine. The Leatt braces also include a thoracic spine strut that makes its way down to the T7/T8 vertebrae. Energy from an impact is transferred from the helmet, to the brace platform, and down through the thoracic strut. The strut also helps to reduce hyper-extension of the cervical spine.


Push the button to open and close the brace. Photo by Matt Miller.

  • In-molded PC shell with a polyamide reinforced EPS construction
  • CoreFlex split rear removable thoracic strut
  • Adjustable thoracic piece
  • Low-profile, push-button open/closure system
  • Injected, durable and easy-to-clean foam padding
  • Ribbed body padding for more air flow
  • Optional clear chest strap
  • CE tested and certified
  • Weight: 536g
  • MSRP: $250

Testing the Leatt DBX 3.5 neck brace

The author getting some indoor air. Photo: Brandon Stewart.

Demonstrating the capability of a piece of protective equipment like this gets tricky for a reviewer. I’m obviously not going to throw myself into a high speed wreck to test the integrity of the DBX 3.5 brace. But, there are a few things I can attest to in this review.

I went with a size L/XL for the brace. Leatt makes sizing recommendations based on the circumference around the rider’s chest and back. Both the thoracic strut and the chest plate should fit flush and not be tilted on the chest or back.

Photo by Hannah Morvay.

The red release button on the left hand side of the brace opens it up to put the brace on. The thoracic strut on the rear is adjustable to two points, and removable. I used the brace with the optional clear plastic chest strap that cinches down for added security and a more snug feel.

It’s December so the bike parks are closed, and I don’t wear a full face helmet on my regular trail rides, so initially I thought it might be a while until I got to test the DBX 3.5 neck brace. Then, I noticed a friend on Instagram posted about an indoor park with a mega-ramp and airbag. I wanted to spend some time learning a few things over the winter anyway, so I checked it out.

The rear end of the brace with thoracic strut. Photo by Matt Miller.

On my first night at Progresh in Denver, I was the only one using the mega-ramp and got around 15 drops. I was sweating like a madman after climbing out of the airbag after the first five times.

I hardly noticed the brace during my session. It feels comfortable and doesn’t seem to interfere with my riding at all. When I was thrown around on the airbag landings, and rolling over myself and the bike, I could feel the brace at work and heard the gentle knocking of the helmet on the brace, preventing me from over-extending my neck.

On a strong enough crash, energy is transferred to the brace and ultimately will fracture the brace to disperse the energy.

I had a little bit of built-up sweat underneath the straps and contact points of the brace, but that’s to be expected. Overall, it was pretty comfortable and hardly noticeable. It’s something that I’ll be wearing every day of bike park riding in 2019, because it’s worth the cost and a little bit more sweat under my jersey.

Leatt’s most affordable option before the DBX 3.5 debuted was the DBX 4.5, which retails for $300.

Photo by Hannah Morvay.


It’s been a great year for affordable mountain bike protective equipment. At Interbike, back in September, we saw more affordable protective gear than ever, including the DBX 3.5. Not everyone’s riding style calls for a neck brace and full-face helmet, but for anyone who likes to go fast and try new things at the bike park, well, give it some thought. It may save your life.

Thanks to Leatt for providing the DBX 3.5 neck brace for review.