The current design approach for bicycle helmet liners has remained unchanged since its introduction in 1975. The majority of liners are still made from Expanded Polystyrene Foam (EPS) and while they provide sufficient protection, they have significant drawbacks. In cases of impact, the impact energy permanently deforms the EPS liner and the complete helmet has to be discarded. Furthermore, cyclists worldwide are limited to four helmet sizes based on the head circumference of standard headforms. In reality, every human head has its unique shape and dimensions. An improper fit causes discomfort and can lead to a significant reduction in head protection.