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.

A seat support assembly supports a cushion of a furniture member. The seat support assembly may include a frame, at least two seat springs, a support spring, and a coil spring. The support spring may be positioned between two seat springs, and the seat springs and the support spring may extend across the frame. A coil spring may be positioned on and attached to the support spring. The coil spring may extend to and bias against the two seat springs positioned on either side of the support spring.

A pocketed spring assembly comprises parallel strings, each string joined to at least one adjacent string. At least some of the strings have springs of different gauge wire and some of the pockets of the strings having springs of different gauge wire are spliced together. At least some of the strings have springs of different geometries and some of the pockets of the strings having springs of different geometries are spliced together. At least some strings may have end sections with springs different than a middle section therebetween, the springs of the end sections being firmer than the springs of the middle section.

A posturized comfort layer for a bedding or seating product has different sections of different firmness due to different mini coil springs within the sections. The springs may be individually pocketed between two sheets of non-woven polypropylene fabric joined with circular seams or rectangular seams. Each circular seam joins opposed pieces of fabric around one of the mini coil springs with curved segments. Alternatively, rectangular seams join opposed pieces of fabric around each of the mini coil springs with linear segments. Regardless of the shape of the seams, the different firmness of the different sections of the comfort layer may be due to the mini-coil springs contained in the pockets.

A pocketed spring assembly comprises a plurality of parallel strings of individually pocketed springs. A dimensionally stabilizing substrate is secured to at least some of the strings on one of the top and bottom surfaces of the strings. A scrim sheet is secured to at least some of the strings on an opposed surface of the strings to maintain the positions of the strings. The dimensionally stabilizing substrate is laterally rigid enough to maintain length and width dimensions of the coil spring assembly. However, the dimensionally stabilizing substrate is flexible enough to allow the pocketed spring assembly to be roll packed for shipping.