Probably the most talked about helmet on the market at the momentthe s one lifer helmet is one of the best fitting and safest helmets for skateboarding longboarding bmx and roller derby the lifer helmet is a dual certified helmet which means it is astm certified to protect your head from multiple low impacts and it is cpsc certified to protect your head from the single high impacts the lifer helmet is a certified multi impact helmet and is up to 5x more protective than the soft foam non c