In the roofing business for more than 10 years, Stephanie and Frank Zehna know that clogged gutters mean call-backs. That's why they install the Hallett Gutter Cover, a flat cover with a small curve at the bottom that lets water flow through while keeping out debris. “The thing we like most is its simple design,” Stephanie says. Its performance surpasses the screen-style covers that the Zehnas used to use.