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 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 certifi