Design Expressions - Stack of Chairs and Barstool Cover (P1A01FA2) 600 denier polyester with a waterproof dioxin free coating Covers for every piece of your patio furniture in a coordinated yellow "flora" design Cover includes a buckle strap system and tie strips to secure cover to furniture Cover includes a built in "positive air-flow" ventilation system to allow moisture to evaporate preventing any mold or mildew buildup UV treated material will keep your covers looking as new as your furniture