Re: 16' SS Boat cover..?
There are plenty out there UNDER $100
Will it be your travel cover?
Material is based on usage. For example, my Bimini is Sunbrella, my travel cover is also an older Poly with Duck reinforcements.
I am making my own bow and cockpit cover out of Odyssey III which is a lighter version of TOP GUN materials.
I double cover mine also so a cotton/duck should be adequate and is the cheapest.
Get a huge ball of twine for wrapping all the mice entry points for the winter, and they can enter thru the drain hole if uncovered, and the cinch rope is OK, but they can get in.
Try to use no less than 9 oz. if it will be a travel cover that has cotton in its weave makeup, you can go lighter if a Poly/Acryllic
Search the web for:
Sunbrella
TOP GUN
Sharkskin
as examples of fabric for covers, and this site iboats sells them also with good descriptions to assist you.