Since I find covers are only good for 3 years whether I buy a cheap blue one or expensive 16 mil diamond clear, I gave up and now buy the 12 mil blue transparent ones. The warranty on a solar cover ONLY covers de-lamination of the assembly strips, not the failure of the cover when the bubbles pop off in the 3rd year. Having been burned twice, my current cover was a cheapie and, in its third year, is probably done, too. It works nearly as well as the expensive one at insulating, and rolls up SO much nicer than a 16 mil!

Carl