What sets Koverroos apart is the breathability of their fabrics. They allow for air flow without compromising their waterproofing and resistance to the elements. Outdoor furniture covers need to breathe so that moisture can escape, keeping mold and mildew from developing under the cover. KoverRoos use technologically advanced materials that are one-way breathable - moisture leaves, but dust and dirt can't get in. Water resistant and breathable, these covers are truly unique and the best that you'll find to protect fine outdoor furniture.