●This product has passed SG standard ●Comes with a dial type size adjustment function (spin dial for a perfect fit! ) ●One-touch buckle (attached strap) ●ABS plastic cap ●Good ventilation and does not get stuffy. (Air vents on the head provide effective ventilation) ●Recommended Age: 1 - Elementary school age (head circumference 19.7 - 22.0 inches (50 - 56 cm) ●Weight: Approx. 14.1 oz (410