Serta Space Saving Upholstered Augustine Grey Sofa Sleeper The Serta Augustine Traditional Couch Futon is one of our most comfortable and space saving casual convertibles with modern serpentine springs padded out with layers of soft foam on top. Add it all up and it's the perfect surface for both sitting and sleeping, and the smooth, stain resistant micro-suede cover and the pillows feel soft and luxurious on your skin.