Aerodynamic bicyclist's helmet construction

Abstract From the Canadian patent

A bicyclist's helmet has an outer shell; an inner liner; forward air inlet structure and rearward air discharge structure, as well as air channelling in between the inlet and discharge to provide ram effect cooling; resiliently collapsible bellows padding on the liner to engage the wearer's head; retention straps that pass through the liner in order to attach to the outer shell; insert plugs associated with the outer shell to anchor the straps in spaced relation to the channelling and collapsible pads; a wrap-around eye protective visor that also provides a sun shade, the visor being detent adjustable at the front of the helmet; and a retention strap buckle that takes-up excess strap length.