Does head protection work in combat sports?

Why do many fighters believe head protection doesn’t work?

This belief is widespread in combat sports and is largely justified by experience. Fighters often associate head protection with bulky padded headguards that do not reduce concussion risk, restrict movement, hearing or vision, and still result in headaches or neurological symptoms after sparring.

Regulatory guidance confirms that conventional headguards were never intended to protect against concussion, mild traumatic brain injury. Their purpose is limited to preventing superficial injuries such as cuts and abrasions. As a result, fighters correctly conclude that “headgear doesn’t work,” when in reality the wrong type of protection has been designed and used ^[3].

Why traditional padded headgear fails in combat sports

Traditional headgear relies on foam padding and surface coverage. While this can reduce linear force and superficial injury, it has limited effect on rotational forces, which occur when the head is struck, twisted, or rapidly accelerated.

Rotational forces cause the brain to rotate inside the skull. This is associated with tearing of tiny blood vessels and brain cells resulting, over time, in the breakdown of the blood-brain barrier and the creation of damaging neuro-inflammation.The cumulative damage caused by repeated smaller-force, sub-concussive impacts is now recognised as a key contributor to later life mood and behaviour problems, including Chronic Traumatic Encephalopathy (CTE). This is a progressive neurodegenerative disease that leads to early-onset dementia in 20/30/40s.

Rotational forces are widely recognised in biomechanics research as more damaging to brain tissue than linear forces, because they generate shear strain within the brain rather than simple acceleration of the skull.

In combat sports, rotational forces arise from:

• Head strikes in MMA and boxing
• Head impacts from throws and sweeps in Judo and wrestling
• Head impacts from takedowns and ground impact in BJJ
• Rotational forces are present in many head impacts, particularly those involving angled contact or head-to-ground impact.

Independent testing that measures both linear and rotational acceleration shows that padded headgear does not meaningfully reduce concussion risk and may increase rotational torque due to added mass and surface area ^[4]. This explains why fighters often still experience headaches or neurological symptoms despite wearing traditional headguards.

What actually causes brain injury in combat sports?

Brain injury in combat sports is not limited to knockouts or diagnosed concussions. It is associated with repeated exposure to rotational forces and small force sub-concussive impacts ^[5], which cause the brain to move within the skull.

These forces are present during:

• Striking exchanges
• Throws and takedowns
• Falls and ground contact

Over time, repeated rotational loading is associated with microscopic damage to brain tissue, disruption of the blood–brain barrier, and damaging neuro-inflammation. Neuro-inflammation is a common feature in several neurodegenerative conditions and is increasingly understood as a pathway through which repeated sub-concussive impacts contribute to long-term neurological risk. This cumulative exposure increases long-term neurological risk, even in athletes who have never been formally diagnosed with a concussion ^[6].

This is why athletes can experience long-term neurological effects even in the absence of diagnosed concussions, as cumulative exposure to rotational forces begins in early years and occurs across training and competition.

How is Rezon Halos® different from traditional head protection?

Rezon Halos® is not padded headgear. It is a CE/UKCA Category II PPE-certified and Virginia Tech five star rated ^[5] protective headband designed to reduce rotational force transmission to the brain.

Key differences:

• Designed around rotational biomechanics rather than surface padding
• Proven to reduce rotational force transmission by up to 61%*
• Proven to reduce concussion risk by 74%*
• Designed to reduce the cumulative damage from sub-concussive impacts
• Holds an internationally recognised Virginia Tech 5-star safety rating

Unlike padded headguards, Halos® does not rely on bulk or foam coverage. It reduces the transmission of damaging forces before they reach the brain, lowering cumulative exposure during training, sparring and competition.

*based on independent testing

“I had 7 rounds of sparring today and I had the Halos® on.
Before I would have a small headache, even after 2 rounds.
But today, no headache after – it’s amazing!”

Matthew. Rezon Halos® Customer

Why doesn’t Rezon Halos® cover the whole head or chin?

Halos® is designed to protect the brain, not to provide full physical head or facial coverage.

Its design focuses on:

• The front, sides, and back of the head, where rotational injury risk is highest ^[6]
• Areas most associated with angular acceleration during impacts and falls ^[7]

The top of the head accounts for a small proportion of head impacts and contributes lower rotational forces. Chin protection relates to jaw or dental injury, not to the rotational mechanics that drive brain injury.

By targeting areas of greatest neurological risk, Halos® reduces damaging force transmission without restricting movement, hearing, vision, or technique.

How can combat sports athletes reduce brain injury risk?

Brain injury cannot be eliminated from combat sports, but risk can be reduced by focusing on brain injury mechanism.

Effective strategies include:

• Recognising the damage of sub-concussive impacts ^[8]
• Reducing cumulative rotational force and sub-concussive exposure during training and sparring
• Using protective equipment designed for brain protection, not surface injury ^[9]

Detection tools identify concussion and brian injury after it has occurred. Rezon Halos® focuses on reducing the amount of brain injury sustained in the first place, particularly during frequent training exposures.