Retrospec Comstock Youth Ski & Snowboard Helmet X-Small 49-51CM Matte Rose (4800) Durable ABS hard exterior protects against any bumps and bruises while the EPS foam interior absorbs any shock of impact that may occur ensuring your little one is well protected Keeping your kiddo comfortable in the cold is the key to a fun day on the slopes. Comstock's netted mesh cap is moisture wicking and highly insulating, while 10 vents provide optimal airflow for breezy descents down the mountain. Plush earmuffs provide comfort and warmth while the adjustable padded Chinstrap helps to provide a perfectly snug fit while eliminating any annoying chin chaffing Includes a durable rear goggle clip to keep your little rider's goggles safe and secure while they make their way down the mountain Tested at a CPSC and EN lab. Absorbs impact energy Sizing Gear up for the summit, snow trails, and everywhere in between. Choosing the right helmet size is crucial for maximum protection and optimal helmet performance upon impact. You want something snug and secure that also provides clear peripheral vision. Use our helmet sizing guide below to find your best fit. SIZEHEAD CIRCUMFERENCE X-Small 19-20.25in (48-51.5cm) Small 20.5-21.75in (52-55cm) How to Measure Your Helmet Size To determine the correct helmet size, wrap a measuring tape around your head. The tape should rest just above your ears and remain level around the circumference of your head.