A boat cover is like a zinc anode, it's intended to absorb the damage and fall apart first,
to extend the usable lifespan and appearance of your boat. A name brand cover that fits
your hull length, width and platform height is where to start looking. Custom fit covers
can be fabricated at any custom canvas shop, cost is directly related to the complexity
of the fit and the amount of fabric needed. Personally, I think the best cover is a garage.
Remember...the middle has to be kept higher than the sides to prevent ponding.
Seen quite a few covers split due to excess water puddling atop the cover.