80 x 39 x 3.5 inches

Japanese 3.5″ Thick Futon Mattress, Portable Tatami Bed for Adults & Kids

Japanese Floor Mattress, 3.5" Thicken Futon Mattress Tatami Mat, High Density Foam Support for Adult Kids Sleep, Portable Futon Sofa Bed for Camping, Pet Mat, Twin 80"X 39"（Silver Gray）. It's dustproof and fits easily in closets or RVs.