THREE SIZE AVAILABLE: Twin size 43" x 84" (for 39" x 80" futon mattress Twin), Full size 58" x 84" (for 54" x 80" futon mattress Full), Queen Size 64" x 84" (for 60" x 80" futon mattress Queen). PROTECT FUTON MATTRESS BETTER: With the dustproof cover, you will no longer have to worry about the clean issue of the mattress, which can greatly improve the durability of the mattress, you can use your futon mattress as long as possible.