Because every bank is different, a 4X6 SOFA is handmade. The load-bearing parts are made of wood and the high-quality foam is covered with a layer of cover material (Dacron) to prevent premature wear of the upholstery from the inside out. Furthermore, we use so-called nosag springs for the seat of each sofa. No Sag is english for not sagging, which is exactly why we use these springs every 8 cm.