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Material: Shell: ABS resin + PC high corrosion resistance material, has excellent corrosion resistance and wear resistance Inner: EPS polystyrene foam absorbs external pressure Size: S Head circumference 19.7"-21.3" Weight: 305g for child M Head circumference 21.3"-22.8" weight: 320g for youth and teenagers L Head circumference 22.8"-24 " Weight: 340g for adults Note: Before ordering, please measure the circumference and choose the right size. Use: Suitable for outdoor sports such as BMX bicycles, kickboards, skateboards, skaters, climbing and mountaineering. Use it not only for cycling but also to drive nearby to avoid danger. Head circumference measurement method: Look at the head from the side, use a ruler or string for the most prominent part, and measure the circumference.