Gutter Cap's patented design uses liquid physics, combining water surface tension, cohesion, and adhesion, allowing rainwater to adhere to the dome of the cap while leaves and debris simply fall off the roof. The existing Gutters become a free-flowing roof drainage system, saving you the hassle and danger of cleaning gutters and saving you thousands of dollars in damage each year. Vinyl systems can warp and crack in the hot sun or during the cold winter months. The vertical channel design tends to clog even quicker than screens.