As a bicycle commuter of many years experience (first in Saudi Arabia and now in California), I thought I was well prepared for any sort of road travel you might expect to encounter in temperate zones. It is ironic, therefore, that I discovered in California (where it never rains ;-]) the fact that no one seems to have come up with a simple bicycle (over the) helmet rain cover. There are apparently a few 'under the helmet' head covers, but the effects of dreaded 'helmet hair' compression are bad enough as it is, without getting to work with an even more firmly plastered down look, thanks to use of a skull-cap under the helmet. At any rate, the more I searched for a simple over-the-helmet rain cover, the more astounded I was to find that not a single bicycle accessory company thought that a helmet rain cover was important enough to bother about producing a suitable item that would provide protection against drizzle and downpour alike. I contacted Bell, Gyro, and any number of bike helmet manufacturers and they all responded more or less the same with the same "Thanks, but we have nothing like this--try a bicycle accessory products company." Meanwhile, I was getting by with a "Columbo Sour Dough Bread" plastic bag wrapped around my helmet that needed to be taped on each time it rained and then removed afterwards (great promotional material for the Columbo French Bread Company, but too tacky for my tastes). Then one evening, during a rare moment spent watching the tasteless, blathering fare of a commercial television channel, a spotted a new S.C.Johnson & Company product, marketed under their 'SARAN WRAP' trade-name. The item was advertised as a disposable food dish cover, intended for use in covering serving dishes containing left over food to be kep in the refrigerator, with the product name "Quick Covers". This item was very much like a plastic shower cap with elasticated edges, but was intended to be disposable (and therefore made with lighter plastic material). The "Quick Covers", as they are called, come in small, medium, and large sizes, with the large size being absolutely perfect for covering a full-size bicycle helmet like the Gyro Boreas so suitably that it is almost as if it was custom-trailored for the helmet. None of that 'shower-cap' tackiness, either. The effect is secure, sized just right, and quite perfect for reuse any number of times. A container of the "Large" size SARAN Quick Covers holds 10 of these covers and the covers themselves are small and compact enough to carry one or two as spares in a bike bag or pocket. If you have to commute through rainy seasons and your raingear is OTHERWISE complete and well suited for rain, consider using the SARAN "Quick Cover" as an external (over the helmet) rain cover for either regular or emergency use. They ought to market these things unchanged at bike shops as SARAN Bicycle Rain Covers. I'd be interested in hearing from anyone who has tried them and has had some experience using them. Thanks.