The S1 Lifer Helmet is one of the best fitting and safest helmets for Skateboarding, Longboarding, BMX and Roller Derby. 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 complies with U.S. CPSC Safety Standard "multi-impact" helmet and is up to 5x more protective than the soft foam non-certified helmets. The Lifer helmet is a breakthrough design combining the added safety of complied ASTM standards for a 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.