Weitengs Bicycle Capacete Mountain Bike helmet cycling helmet &pound;&uml;Adult&pound;&copy;Red Use ONE STEP technology material suitable for people whose head width 17.5cm, adjustable head circumference 56-63cm Acu Dial fit system high-quality foam layer, with regulating torsional, can adjust Super light material, equipped with light; Wind tunnel, duct design, Effectively reduce wind resistance.