Waterproof, no. Water resistant, yes.
Australia is the driest populated continent on earth, with only 1% of the world’s water, so why spend money trying to protect our cars from something we don’t have enough of, when what we should be doing is protecting our cars from the sun’s harsh U.V. rays which creates far more damage than rain.
If you are using a Zelanga Shade as an outdoor entertainment cover, you will be pleased to know that you will remain dry during light showers. If the rain gets too heavy, you probably should be thinking about retreating inside anyway!