Reliable Full Head Crash Protection: Built with durable PC shell, thick shock-absorbing EPS foam and extended rear coverage using in-mold craft. Effectively buffer impacts when kids ride bikes, skateboards or scooters, offering solid all-around safety for boys and girls Adjustable Sizing Grows with Your Kids: Covers head sizes 19.7"-22.4"(50-57cm), perfectly fits ages 2-4, 5-8 and 8-14. Flexible fit system adapts to different head shapes, no frequent helmet replacements needed. Measure your kid’s head for ideal wearing experience LED Safety Light & High Ventilation: 3 flash modes (steady/slow/fast) improve visibility at dusk or cloudy days to keep kids seen by vehicles. 16 air vents with breathable inner liners accelerate air flow and reduce sweat in hot summer Ultra Lightweight & Custom Snug Fit: Only 290g light weight, no neck strain for long-time outdoor play. 360° adjustable dial plus flexible side straps let you quickly tweak tightness, avoiding slipping or pinching during cycling and skating Removable Detachable Visor: Quick attach & remove visor shields harsh sunlight and light rain, adds extra facial cushioning to buffer impacts when kids fall during sports Trusted Safety Standard: Our kids helmet complies with U.S. Consumer Product Safety Commission Safety Standard for Bicycle Helmets for persons aged 5 and older, ensuring maximum protection for your child