Seventeen Vents Sizing Pad With Easy To Use Straps And Buckles Comfortable and Best Fit Possible The V-17 helmet from Razor is perfect for safety and comfort. The V-17 is a multi sport helmet suitable for bikes, skateboards, scooters or any other sport where great looking and fitting headgear is essential. Seventeen vents keep young riders cool. The V-17 fits youth from 8 to 14 years old with a head measurement of 21 1/2" to 23". CPSC rated.