It’s virtually impossible to design a windproof umbrella that would never invert and also be light enough to carry. Windproof umbrellas are designed to withstand wind speeds most people actually experience. Many of these umbrellas can withstand gusts between 25 and 55 miles per hour. In most cases, strong weather systems that cause wind gusts higher than 55 miles per hour create other hazards that should keep you indoors. In other words, if you go outside during these kinds of storms, you may face bigger problems than your umbrella inverting.