I have had this for about a year. My patio sits under three huge oak trees between my neighbor & my yard. I have two in my yard, she has one in her yard. I live in an HOA, so a pergola requires a lot of paperwork to get approved. With that being said, my patio is completely open to the elements. I have covers for everything because it gets messy between the leaves, pollen, bugs, rain, etc. I ordered the wrong size because I was too lazy to go out & measure the sectional. So far the cover has held up WAY better than any grill covers. I live in central FL, so there’s lots of rain & humidity. Add in my patio is in the open under a bunch of huge trees so the cover is stained & there are signs of mildew. Not a huge deal for me. My only concern was protecting my seating to prolong the life & keep it cleaner. It’s doing its job. I’m very happy with the seating cover.