All kiln-dried hardwood frames are backed by an exceptional 10-year structural warranty. The heat-tempered, double-coil steel springs in most sofas are eight-way hand-tied, a time-intensive process employed by only the finest furniture makers. This creates extra stability and ensures that your sofa won’t sag in spots after a few years. The baffled down wrap on many of our high-density foam cushions also prevents sagging to one side. Unzipping the cover and refluffing the cushion’s interior will help maintain its shape over time.