Browse our FAQs below. If you can’t find the answer you’re looking for, get in touch.

Koroyd is a welded tube structure which is integrated into various products from action sports helmets, to skis, industrial worker’s protection and in-vehicle child seats. Koroyd’s primary purpose is to absorb energy when impacted and to protect the wearer from serious injury.

As well as being an industry leading energy absorber, Koroyd is also extremely breathable and ultra lightweight.

Koroyd’s welded tubes crumple instantly and consistently on impact, absorbing maximum force in a controlled manner, minimising energy transferred to your head. This unique behaviour helps to protect your skull and brain from direct and angled impacts which may reduce the risk of suffering a life-changing injury.


This helps decelerate your head and reduces the amount of impact energy which could be transferred to your skull and brain.

Basic physics – by absorbing the maximum amount of force from all impact types, Koroyd is also able to reduce the rotating motion which your brain could endure as a result of an angled impact. 

Studies prove, in the event of an angled impact, when direct acceleration is reduced (by absorbing energy), there is a 91% correlation* with a reduction in the rotational motion of your head and brain. In simple terms, if your helmet absorbs more energy, you are better protected from any angle of impact.

*For more information refer to independent study: 2001 COST 3277.

Yes. Air flows consistently through the open-cells, whilst hot air from your head can easily escape, ensuring more efficient cooling in the most intense conditions.

Yes. Koroyd features the world’s thinnest walled tubes, resulting in a structure which is 95% air. This reduces weight and enhances comfort without compromising on safety.

Expanded polystyrene (EPS) is a rigid and tough, closed-cell foam made of pre-expanded polystyrene beads. It densifies when impacted which can result in energy being transferred on to the user.

Koroyd is lighter, more breathable and offers much better protection – distinct performance advantages without compromising one for another.

When impacted, you may not be able to see the deformation of the material as the damaged area could be hidden inside the product.
If you have had a serious accident and impact, we do not recommend using the product again.

If the Koroyd core has been impacted, we cannot guarantee it will be as effective in an accident.
However, Koroyd can absorb up to 78% of the material’s thickness with consistent performance. 
If in doubt, please take the product to your retailer so they can assess if there is any damage.

The distortion of the tubes does not affect the energy absorption performance of your product – this is merely cosmetic.
At 0.06mm thick, the walls of Koroyd’s tubes are the thinnest extruded polymer tubes in the world and whilst this offers advanced energy absorption characteristics, it can make it very difficult to install the parts for our partners’ factories.
Therefore, a certain level of distortion is expected and acceptable. 

Koroyd does not absorb water and is therefore not affected when wet.

Koroyd’s performance is consistent between temperatures of -20°C to +50°C.

We recommend that any helmet featuring Koroyd is replaced every five years as there are many components in the helmet which have a lower life expectancy than Koroyd.

No. Koroyd is a welded tube structure. The cells are circular, not hexagonal.

Koroyd is made up of tens of thousands of co-polymer extruded tubes which are thermally welded together.

No. Koroyd is made from virgin materials because only this can provide the purity needed for maximum and consistent impact protection. Every time plastic is recycled, it loses some material strength which means its performance can be affected by the process.

Yes. Koroyd is 100% recyclable. Please ensure you separate other materials before recycling.

The production of Koroyd takes place in Germany, the head office is in Monaco.