Blue Wave 18-ft Round Winter Pool Cover

I have a 21' above ground pool so I ordered the 21' cover. The cover is actually 25' in diameter so it fits my pool perfectly with plenty of overhang even with an air pillow underneath it. Be aware that you get what you pay for. This cover is made from run-of-the-mill nylon/polyester mesh fabric with a polyethlene coating (the same as those cheap blue poly tarps from the hardware store). I seriously doubt that this tarp will last more than one or two seasons (my previous cover lasted one season and it was made of the same material). The "8-year" warranty is very misleading. Year 1 is 100% covered, year 2 is 50% off retail, year 3 is 40% off retail, year 4 is 30% off retail, year 5 is 20% off retail, year 6 is 15% off retail, year 7 is 10% off retail, and year 8 is 5% off retail. But, again, this is an inexpensive cover and should get the job done for a season or two. It fits perfectly and I'm happy with my purchase. UPDATE 10/31/2014 ================= The cover worked well for one winter season. We removed the cover in the Spring, hosed it off, and stored it in our crawl space until this Autumn. We closed down our pool and re-installed the cover about a month ago. We noticed that there was always a layer of water on top of the cover even after we pumped it dry. We just figured it was rain or dew buildup, but after a dry spell there was still a lot of water on top of the cover. We ended up buying another (same) cover and spent a great deal of time siphoning off the water and removing the old cover to install the new cover. While doing this we noticed lots of tiny holes in the old cover which is how the water was seeping on top. We got the new cover installed and everything is good now. Bottom line: the cover that we purchased a year ago only lasted one season. We're now on our second cover and we expect it to only last one season as well. This cover is pretty inexpensive so you get what you pay for. UPDATE: 09/19/2016 ===================================== I've now gone through THREE of these covers. The first two each lasted about two seasons (which, honestly, is what I was expecting). But the third cover didn't even make it through one season. A few months after covering our pool, the weave began to separate and water would leak up through the cover. Very poor quaity in my opinion. Third time's the charm, we will not order this over again.