In design and construction, the KoverRoos® outdoor furniture covers are the best on the market. Outdoor covers need to breathe so that mold and mildew does not grow. These covers use quality materials that are one-way breathable. This allows moisture to escape while still keeping dirt out. These light-weight covers are stronger than most vinyl ones.KoverRoos lll This 3-layer nonwoven protective cover offers durability. It is perfect for slightly harsh or windy climates. It has a soft inner layer that protects your furniture's finish. 3-year limited warrantySupraRoos™ This 2-layer nonwoven protective cover resists UV-rays, high wind, and inclement weather. It will last through long periods of rain, snow, or strong winds. 10-year limited warranty; 5-year warranty against color fadingWeatherMax™ This patented cover will retain its color and strength in severe weather. It is extremely breathable and durable. 10-year limited warranty; 5-year warranty against color fading