Building a custom-sized sectional cover or adding a piece to your current configuration? Simply choose your collection and add the pieces you need to your cart! Featuring solution-dyed polyester with a waterproof-coated interior, YKK technical outerwear zippers and UV-resistant, anti-wicking polyester thread, Yardbird's fitted furniture covers will help protect your set from all of the elements. Please Note: Armless insert covers are designed to be used as part of a sofa or sectional cover; not for standalone chair covers.