Welcome, for more information about the product, please see the description1. Adjustable helmet size is S(52-54cm),M(54-56cm)2.Comfortable and ultra-light: Easy to adjust and perfectly adjustable adjustment system, soft filling/filling and a perfectly shaped look ensure this3.Vents help ensure the flow of fresh air and hot air and ensure health.4. Adaptability: bicycles, roller skates, hip hop, skateboarding, BMX, snowboarding, scooter, skateboarding and outdoor sports more5.Color: Blue ,RedIf you have any questions, please contact us, we will reply you within 24 hours
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