A seat assembly for insertion into a piece of furniture has a frame having opposed sides. Each side may have openings therein for supporting clips. Upper and lower sinuous wires extend generally across the frame. Upper stabilizer wires are secured to the upper sinuous wires and maintain the spacing thereof. The clips secure each of the sinuous wires to the frame. Coil springs are secured to the upper stabilizer wires and the lower sinuous wires. The clips securing the upper and lower sinuous wires alternate along the sides of the frame.