About 20 years ago I got an umbrella with this shape designed by students from Delft University in the Netherlands. It never tipped over no matter what the wind was like. When it finally started falling apart I wanted another one and this is what I was able to find. It seems even better than the first, and the eight ribs are strong. So far it has withstood fairly strong gusts of 20-30mph. It's not cheap so don't leave it on the bus.
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