Every Advanced Spa Cover comes standard with a vapor barrier that is up to 35 times thicker than the traditional covers vapor barrier.
The Advanced Spa Cover has a minimum vapor barrier of 65 mils. Your traditional cover offers vapor barriers of 2 to 4 mils standard.
The materials use as the vapor barrier of an Advanced Spa Covers is commonly used to protect buoys floating in the ocean for decades with no damage.
The vapor barrier used in a traditional cover is NOT recommended for exposure to oxidizers such a chlorine or bromine
The vapor barrier in an Advanced Spa Cover is actually used to line storage tanks to contain chlorine and bromine.