Challenge your limits
Like every GPA, the 4S helmet was developed with maximum protection as the focus. The 4S is a technological revolution with its 4 layers which enable optimum shock absorption as well as better resistance to lateral compression.
Unparalleled damping
The outer shell, made of absorbent polymer, absorbs a first part of the shock by deforming.
The 2nd layer will take up the energy of the impact to absorb it.
The 3rd shell, made of fiberglass, ensures the rigidity of the entire helmet to avert lateral compression.
The 4th layer is the polystyrene shell which completes the deceleration of the shock by crumpling under the impact, thus protecting the ctanial vault from brain injuries.
An optimal ventilation system
Thanks to its numerous front and side vents and its rear outlets, this helmet provides maximum ventilation.
Unparalleled comfort
This new one-piece and removable liner can be washed and, if necessary, replaced. The soft and fluffy inner has been given and antibacterial treatment.
Better neck protection and increased hold.
The classic chinstrap is replaced by a hybrid system, a new exclusive from GPA. A cross between the twin lock system and the traditional chinstrap, its rear part is made of thermoplastic resin and incorporated fiberglass fabric. Its nylon straps, covered with synthetic leather, fasten by means of a two-part buckle. Thanks to its rigid part at the back which extends the shell, the Hybrid"s chinstrap guarantees more extensive protection and better support for the helmet on the head. Its more affordable price and design will win over the more conventional riders as well.
Helmet shell 1: Sizes 52 - 56 cm
Helmet shell 2: Sizes 57 - 61 cm
