FANTASTIC, strong and very good water repellent qualities!! I don't normally review things, but this product deserves it! We are one of the families who just went through the "Dirty side" of hurricane Harvey! We sustained high winds and rains for 5 days (almost 30" of water in my area). I would see our patio furniture and the covers flapping, shaking and completely wet and wondered what it'd look like after (wet, mildew, etc?). Today's the first day we get sunshine. I went to check the patio stuff, uncovered the furniture, and EVERYTHING WAS DRY! Not a spot, no mildew, no smell of humidity! I would buy these covers again!