Melon Urban Active Collection Helmet The hi-tech in-mold construction, make it 30% lighter, to comparable hard shell helmets 3 base sizes are available, each adjustable further through Coolmax pads and adjustment system 12 air inlets, air channels and a Fidlock magnetic buckle offer class leading comfort Hygienic Coolmax paddings made from extra soft foam for an excellent exchange of moisture XXS-S (46cm-52cm), M-L (52cm-58cm), XL-XXL (58cm-63cm)