I had one of these and lost it!!! I was so happy to find it here on Amazon. It folds up into a small cylindrical shape that can fit into a large pocket on a coat or parka. It pops open with the push of a button.  It is quite windproof too. When you want to close it you simply push the button on the handle again, it collapses down, and you take the snap fastener and wrap it around the umbrella and you are done.  There is a cover that slips over the collapsed umbrella.