Should a cover on your boat slip cover the sides? We think not! Spiders like dark and humid areas with no wind. When you cover the sides of your slip all you are doing is creating a spider habitat. With the Bikini Top, your boat is protected from the mid-day sun, it allows the breeze to equalize the humidity thus removing the opportunity for mold to start. Plus, the Bikini Top allows 360° access to your boat, perfect for loading/unloading, maintenance, installing a fitted cover, or just having a comfortable place to sit on the dock that is out of the sun.