ABS SHELL [HELMET]
An ABS Shell is a terpolymer made by polymerizing styrene and acrylonitrile in the presence of polybutadiene. ABS's light weight and ability to be injection molded and extruded make it useful in manufacturing products such as cycling helmets. The ABS Shell acts as a protective layer for whichever foam construction (whether EVA or EPS) is being used.
The updated helmets are equipped with a liner of Expanded Polypropylene (EPP) instead of EPS. Unlike EPS, EPP does not deform permanently on impact and is therefore suitable to absorb repetitive shocks.
SPIN works by allowing pads placed inside the helmet to shear in any direction during an oblique impact, a process inspired by the brain's own internal protective system, cerebrospinal fluid, which cushions the head during a fall. By using the innovative and unique pad technology, which sit directly against the user's head, SPIN pads allow the helmet to move relative to the head during a fall, reducing the force transmitted to the brain.