Wagan EL2325 Snowbrella/Sunbrella Back Windshield Cover Use the black side as the snowbrella, flip over to the silver side for the sunbrella. Snowbrella saves you time before you drive away - eliminates scraping your windhield when it snows! Sunbrella protects your vehicle's interior from harmful UV rays. Easy and fast installation. Simply cover windshield outside, pull the ends of the cords inside the window and hook them together in the middle, then close car doors. One size fits all.