The Double Up Sofa was conceived as a key product to re-energise the furniture maker Sturm und Plastic’s brand. Its innovative interlocking design has won global acclaim, and it was featured in ‘New Chairs, Design, Technology, and Materials’ by Mel Byars, which showcases some of the best designs of the century. Made out of self-skinning polyurethane, the double up comes in a variety of colours and lengths.