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 warranty KoverRoos®MAX This eco-friendly patented cover will retain its color and strength in severe weather. It is extremely breathable and durable.