The Onek helmets are compose of Polycarbonate and advance ABS composite injection molded outer shell combine with an EPS lineThe EPS liner is the main part for impact absorption in a helmetOnek uses only EPS of a high quality with a density making the helmet perfect for impact absorptionThe Onek helmet are subject to three different test .first the impact test which simulate a rider falling on his/ her head. The test measure the helmets ability to absorb impact