I've never had an umbrella blow inside out on my from the force of the wind before, but when I needed to buy a new one (I own like three small umbrellas and they are never around when I need them to be) I went for this one because the reviews were good and I figured the windproof-ness would be an extra bonus.

Today was my third time using it, and the wind blew it inside out TWICE on the 100-yard walk from my car to my work building, and my clothes are still wet hours later. It's otherwise a perfectly fine little umbrella, but it's being returned and I do NOT recommend purchasing. I'm still on the hunt for a good umbrella.