SIS Cover Linen Flax Futon Cover Fabric (Removable futon cover fabric only. Futon frame and futon mattress sold separately) - Full Full cover 54" x 75" Three-sided zipper closure for easy removal. Removable Cleanable Futon Fabric SIScovers guarantees all products on workmanship and materials for life! Your futon cover is important for several reasons. It provides protection for your mattress. It can be easily removed and cleaned. It makes for easy decorating--choose from hundreds of styles. It's economical--when you want to change your style, simply change your cover.