Other gutter guard systems can clog, filter in debris, freeze and break under the friction of roof weather. RainDrop Gutter Guard easily fits on your existing gutter system. It's made from polypropylene materials which allows it to be flexible, absorb heat and cold, and keep a consistent flow of water. That's why RainDrop has a 20 year limited warranty, that's how much we believe in the power it has to improve your homes gutter system.