When you buy a windproof umbrella, you're usually paying for one of three different types of construction: double-canopy, fiberglass ribs, or a flexible frame.
Double-canopy umbrellas have an outer layer of fabric and an inner layer that are sewn together at the edge of the umbrella. This creates a pocket of air between the layers that acts as insulation against wind gusts. Fiberglass ribs are also used in some windproof umbrellas. They're more rigid than traditional metal ribs, which makes them less likely to bend or break in high winds. And finally, some manufacturers use a flexible frame made from materials like steel or aluminum. These frames can withstand high winds without breaking or inverting.