Viking Adult Multi-Sport Helmets and Viking Youth Multi-Sport Helmets are certified helmets for Skateboarding, Inline Skating, Biking, and Snowboarding. Viking designs helmets for knocking into hard curbs, and coming down unexpectedly on asphalt! Do not substitute a “soft” foam bike helmet for these rough sports! Not only will these helmets protect your head from injury, you will look great at the same time! All helmets have a special moldable inside to form to the shape of your head after just a few days of wearing! Helmets are one size fits all.