I waited until we had weather to prove this review. In the last few weeks we've had storms, heavy rain, and winds gusts to 30mph. My chairs are on a 14' x 15' covered deck. My chairs with cushions on them measure 33h x 33d x 29w. These covers are a heavy material with lighter material at the bottom and an air vent in the front. Water beads up on them. They don't drag on the ground so water runs off nicely. They have a leg clip to attach them to a front leg and a drawstring to tighten the fit. I tied the drawstring on the opposite back leg which may not be necessary, but I do wish there was another clip. They haven't blown off. I had a hard time finding a cover to fit my chairs. These are near perfect. I bought another set once I got the first set and tried them out. We have oak tree pollen falling now and they protect the white cushions from turning all green. They fold up fairly easily when removing them. Although these are heavier material, so they don't fold up real small. Great purchase! I hope they perform well next winter!