How do cycling helmets work?
Cycling helmets are generally made with a hard outer layer of rigid plastic, and are then lined with a softer, light-weight foam. All-round helmets cover as much of the skull as possible, with some reaching as far as the neck, and others stretching down over the forehead. Helmets are designed to withstand the impact of a fall or accident, protecting the head from injury. The inner liner is designed to absorb the majority of shock caused by impact, preventing the head and brain from sustaining damage.