Easy to fit junior bike helmet that features 6 air vents. Specifications: Size: - S 52-56cm Weight: - 238g Technologies: ONE HAND: - One-hand quick dial system for anatomic perfect fit. BI-DENSITY PADS: - Dual layer foam pads for an optimal comfort. EUROPEAN STANDARDS: - MASSI helmets are tested under the current European Standards and Directives for bicycle and personal protection equipment. HIGH IMPACT TEST: - HIGH IMPACT TEST certification guarantees the highest standard of safety.