We make this cover for Sanger.
Part # DJBC449 - '07-'13 SANGER V210 W/TOWER MOORING COVER, BLACK
It is made so it can be towed without tie-downs at highway speeds and has the highest water repellent treatment of any othe available fabric.
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Breathability is a fallicy and a poor trait for a mooring/storage cover.
We have Technical Bulletins that can help explain.