So far (about one and a half months) through lots of wind, rain and some snow, this cover has served us well. We have a "27" foot mid-profile fifth wheel, which is actually 28 feet nose to tail. We're glad we got the slightly larger cover. There seems to be enough air circulation and, while not billed as "waterproof", the cover is keeping most of the rain off the roof of the trailer, which was our main goal. Four weeks before getting the cover, our RV roof was damaged by heavy snSee full review