Compatible with OTG and Helmets: The X400 youth ski goggles feature an adjustable elastic headband that can be resized to fit most people, including children. The sturdy, long, adjustable headband is compatible with any ski helmet. Anti-Glare and UV Protection: The spherical mirror lens offers multiple functions, providing peripheral vision and distortion-free clarity. A mirror coating prevents harmful light and glare, while the lens material ensures UV400 protection. Balanced light transmittance makes it suitable for a variety of winter sports such as skiing, skating, rock climbing, motorcycling, cycling, skydiving, bungee jumping, shooting games, and snowball fights. Clear Vision with Anti-Fog: Advanced anti-fog lenses feature a durable anti-fog material and high-performance hydrophilic coating on the inner lens, and a professional ventilation system reduces fogging and optimizes airflow within the lens. The outer lens uses ultra-hardened technology for improved scratch and impact resistance. Clear vision is provided for skiing and snowboarding. Safety and Comfort: Child safety is paramount. These ski goggles for boys and girls feature a soft TPU frame and impact-resistant PC lenses, providing extra safety in case of falls or collisions. Breathable, soft sponge protects the eye area and offers excellent sweat-wicking properties. The children's ski goggles come in different colors and offer a natural, smooth ventilation system for fresh air. Regarding size and lens selection: Ski goggles are generally suitable for children aged 5 and up, toddlers, and both boys and girls. These ski goggles are suitable for both sunny and cloudy days, with higher light transmittance in low light conditions and lower light transmittance in bright sunlight. Don't miss out on the fun of skiing because of unsuitable ski goggles; find the perfect ski goggles for you!