Starter Helmet S/M S/M Helmet fits head sizes between 51mm-55mm L/XL Helmet fits head sized between 55mm-59mm High impact outer shell has 12 vents and a matte finish for added style and protection The foam core with padded liners provides extra absorbing power Adjustable nylon chin strap with clip for easy visibility and quick access Recommended for ages 5-9 years for optimal fit Established in 1965 Kryptonics is one of the most authentic brands in skateboarding and still remains an innovating force in the industry today. Kryptonics changed the game in 1976 by developing the first urethane skateboard wheel and the innovation hasn t stopped since. Kryptonics now dominates the market with a lineup of complete skateboards - including cruisers longboards standard 31 in skatepark models and retro poly plastic torpedo boards. Every detailed construction of deck truck bearing and wheel is considered to reach all age groups and riding styles. Kryptonics completes come fully assembled with grip-tape and skate hardware make sure to adjust trucks based on skating preference and ability and remove the protective wheel cover which may be installed. Always remember to wear skateboard protective gear (skate helmet knee pads elbow pads and/or wrist guards) that supports the rider s skill level.