The first consideration is material; one of the most important when deciding which boat cover ticks the boxes.
Rule # 1 – if it’s a nylon cover, walk away. Fortunately, nylon boat covers are few and far between, but they do exist. They’re often very inexpensive, but nylon doesn’t hold up well in the sun. If you’re enjoying a few sunny days during the winter, the material is at a very high risk of weakening, potentially leading to damage to your boat. At best you won’t be getting the protection you need.
Acrylic is another material that may seem like a good idea, but we don’t think it’s 100% right for the job. The advantage of acrylic, of course, is that it’s a breathable fabric which helps to prevent mold and mildew buildup on your boat. But it’s weak, has low resistance, and is remarkably high maintenance. Acrylic will require additional waterproofing over the years.