The Lifer Helmet uses a specially formulated EPS Fusion Foam which allows it to protect your head from multiple low force impacts as well as high impacts. The Lifer Helmet is a Certified multi-impact helmet and is up to 5x more protective than the soft foam non-certified helmets. The Lifer helmet is a break through design combining the added safety of a CPSC and ASTM certified helmet with the comfort and fit of a non certified helmet. The S1 Lifer Helmet is the best fitting High impact and Multiple Impact helmet on the market. Need to refresh your helmet liner or adjust your helmet size? You can get spare Linersin our helmet section!