ASTM CPSC Certified Helmet for Year Olds Elementary School Grades Safe for Bicycles and Small Lightweight, & 4/5/6/7/8 (Toddlers, 1-2), Scooters,

XS: 46-50cm Recommended age: Babies and toddlers 1-3 years old S: 50-54cm Recommended age: Children 4-8 years old Dual Standards: Meets American CPSC and ASTM safety standards as a bicycle helmet. Comfortable and convenient ❘ 360° protective cushion, removable and washable. All-round adjustment: Head circumference adjuster, side ear adjuster, one-touch pack, length adjuster. Four adjusters allow for all-round adjustment. Cooling System: 11 vents and 6 cooling channels Children's Bicycle Helmet, Suitable for Elementary School Students, Toddlers, and Babies, Lightweight, Breathable Sports Helmet with 360° Adjustment, CPSC/ASTM Bi-Safety Standards