Extra pads supplied for size adjustment.Note: Not suitable for motor vehicle useFits head sizes with two removable liner for different head sizes.Large Big Bore Vents, help kids keep cool during sports; Children’s safety helmet for biking, skating and more.Adjustable dial system and chin strap maximize the best fit and comfortable wearing.Made of PVC material, lightweight, prevent wrist, elbow, and knee injuries. Ventilated EVA foam provides cool air flow.Pads with multiple adjustable Elastic Straps and Hook Loop fit for various knee/Elbow/Wrist circumference.