Re sun, I recall reading a cgoab trip journal of a fellow biking in Mexico using one of those "da brim" thingees that goes over your helmet and recreates a wide brim like a big cowboy hat, or a big straw hat, or an Asian peaked "workers in a rice field" hat--basically the whole idea of keeping the sun off your face and neck isn't new, and being genetically British, I do have to be careful, so I do appreciate even a front visor (and am careful with applying sunscreen, at least 50, it works great)