"CHECK YOUR SOFA SIZE FIRST- This is a Topper size-Width of our cover is 60. Length is 72 and fabric has stretch sides so will fit 4-7"" depths. NOTE: Check length of your mattress closely as many ""Queen"" Size can be 80"" long and will not fit. COMPLETE PROTECTION- This is not a fitted sheet style cover or a Pad. This covers zips closed on all 6 sides & protects your sofa mattress from Dust, Pet Dander, Pollen, Liquids or whatever nature sends your way. LOCKING ZIPPER ENCLOSURE- NOTE: THIS IS NOT LIKE A FITTED SHEET. Patented secure locking zipper which seals off the Sofa bed mattress from anything outside layers of your mattress. Sleeping on an unprotected mattress exposes you to all different types of allergens making it difficult to breathe TRUSTED BRAND- Allersoft is manufactured by Narcote, a 65 year history of producing quality textiles. All Allersoft branded products come with a Lifetime Warranty on all workmanship."