B=> The seat and springs

To create an even base for sitting, upholsterers sew, and then attach heavy-gauge seat springs individually to a jute webbing using clips. Then the springs are connected one to the other in a methodical eight-way hand tie process. To prevent shifting, a burlap layer is sewn over the springs and a hard edge is formed to add comfort and preserve cushion fronts as well as the outer layer of fabric. Some mid- to lower-end sofas use prefab coil units, which can still be quite good. However, experts agree it's best to avoid zigzag springs, (sinuous wires, stapled across a frame) which are an inferior method of production.



To prevent shifting, a burlap layer is sewn over the springs and a hard edge is formed to add comfort and preserve cushion fronts as well as the outer layer of fabric. Some mid- to lower-end sofas use prefab coil units, which can still be quite good. However, experts agree it's best to avoid zigzag springs, (sinuous wires, stapled across a frame) which are an inferior method of production.