I've said it before and I'll say it again...a 12 mil silver/blue cover is the best value for the money. Most of these have a 2 year warrenty and will last about 3! They are only slightly more expensive than the 8 mil all blue ones that will last about 1 season. The expensive covers don't last any longer (sometimes the even don't last AS long) and don't really do any better job of keeping the heat in the pool.