Not sure if any cover is gonna be truly water proof with the way it rests on the griddle. It naturally sits low allowing water to puddle. Last year I had one of my rare bright moments...lol. I placed a full sized aluminum pan upside down under the cover...right in the middle of the griddle. Haven't had a drop of water penetrate the Blackstone cover since as the water now runs off. My cover is over 2 years old...quite faded now, but has held up well.