EuroSchirm's 'birdiepal outdoor' is a great extreme-weather umbrella. It's of traditional design, but constructed very strongly with glassfiber etc. Their website sucks, but they have a video somewhere of someone driving over it, taking it under a waterfall and generally abusing it. You can still flip it upside down, but it doesn't harm it, it seems.
EDIT: Here it is on Youtube:http://www.youtube.com/watch?v=F3oyTyWq9_I (don't bother unless you are _really_ passionate about umbrella's. I can't believe I've actually put this much effort into this comment...)
http://www.euroschirm.com/intro/index2.html
EDIT: Here it is on Youtube:http://www.youtube.com/watch?v=F3oyTyWq9_I (don't bother unless you are _really_ passionate about umbrella's. I can't believe I've actually put this much effort into this comment...)