One-touch buckle The helmet uses a "one-touch buckle" on the chin for easy attachment and detachment. Buckle cover Prevents skin from being caught when fastening the chin strap. Adjuster dial Prevents skin from being caught when fastening the chin strap. Safe at night Equipped with reflective tape in three places: "left, right, and rear" to reflect car lights and alert vehicles to the wearer's presence! ● Size: 47-51cm ● Approximate weight: 260g ● Age guide: For infants and toddlers, approximately 1-3 years old *Do not use for infants under 1 year old.