The materials: both light and robust
Impact reduction technologies, such as MIPS and SPIN, are vital to rider protection, but they are only part of what makes an effective helmet. The quality and type of material used for the helmet shell also plays a crucial role in overall protection. There are 3 types of hulls that dominate the market: ABS, EPS, and In-mold hulls. Each of these materials offers different benefits in terms of safety, weight and durability.
ABS (Acrylonitrile Butadiene Styrene) hulls: ABS hulls are known for their high impact resistance and rigidity. This type of plastic is very durable and resists scratches and small punctures well. Helmets made with ABS shells are often heavier, which can be a disadvantage for some cyclists especially on the road, but they offer the strongest protection against direct impacts.
EPS (Expanded Polystyrene) shells: EPS is the most popular choice for the majority of bicycle helmets due to its ability to absorb energy during an impact. When the EPS shell is struck, the material compresses and dissipates the energy of the impact, reducing the force that reaches the head. EPS helmets are lighter than ABS, offering a good balance between weight, comfort and protection. However, they are generally less durable and may require replacement after severe impact. These shells are most often used for disciplines that require lightness such as road cycling.
In-mold Shells: In-mold technology combines a polycarbonate outer shell with an EPS liner during the manufacturing process, fusing the two together. This process makes it possible to obtain an extremely light helmet. In-mold helmets offer excellent impact resistance while being lighter than those made only of ABS or EPS. The fusion of materials also allows the formation of more complex structures for better ventilation options and a more elegant design. However, just like EPS helmets, In-mold helmets may be less durable against daily wear and tear compared to ABS helmets.
So which case to choose?
It all depends on the activity you are doing. For active activities such as mountain biking, an ABS helmet offers the necessary robustness. If you are not looking to save weight and you have a reduced budget, it is also a good compromise for use in the city. For road cyclists, bikepacking cyclists, or simply those looking for a good balance between protection and lightness, EPS or In-mold helmets are the most suitable.