The cover is remarkably stable for the price. I do not trust the plans for a true waterproof. However, this is not only beneficial. Finally, hardly takes place an exchange of air. The motorcycle could rust through the condensation. If you so lays the tarp over the bike, that air comes it, then it is really great. The sleeve is internally coated with a fluid which protects the paint. The value for money is really so fine. I'm very satisfied.