Style and support together determine the type of foundation used in sofa and chair construction. Eight-way, hand-tied, coil spring construction was once considered the hallmark of quality upholstery. In this type of foundation, each coil spring is placed in the seat by hand and tied into place with twine in a series of interlocking knots. Today, other construction techniques, including new steel spring configurations, offer equal comfort and durability. In general, the number of springs in the foundation and how they are reinforced determines cost and quality.
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