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Dune 2.0 Model The Dune bike helmet is suitable for mountain biking and road racing. The included helmet bag allows for easy storage and protects against dust and dirt STAY COOL The bike helmet has 14 built in vents to allow air to circulate and keep you cool. STAY COOL The bike helmet has 14 built in vents to allow air to circulate and keep you cool Light holder & visor: includes a special removable visor and a bracket for attaching a tail light COMFORTABLE FIT Easily adjust the height and circumference with the one hand adjustable adjustment system