The S1 Lifer Helmet is fully certified to help protect against multiple low impacts and single high impacts. It contains the best technology for head protection, offering a lightweight and comfortable fit. S1 Lifer Helmet Specs Specially formulated EPS Fusion Foam Certified Multiple Impact Protection Certified High Impact Protection 5x More Protective Than Regular Skate Helmet Deep Fit Design AU/NZ Standard Certified (Australian/New Zealand Skate/Bike) AS/NZS 2063:2008 CPSC Certified (US Skate/Bike) ASTM Certified (Multiple Impact) F 1492 CE EN 1078 (European Skate/Bike) The S1 Lifer Helmet is one of the best fitting and safest helmets for Skateboarding, Longboarding, Mountain Biking, BMX, Scootering, Roller Skating 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 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. The S1 Lifer also features a anti-microbial/moisture wicking sweat absorbing liner which helps create the perfect fit! For the best fitting and safest helmet protection on the market in the widest range of colours & graphics, look no further than S-One Helmets! S1 is now Australia and New Zealand's preferred choice for helmet safety protection. For sizing, refer to size chart image for more details.