Another coil found in the convertible sofa is the rotation coil. This coil is found at the bottom inside of the sofa frame, which keeps the mattress in line with the bed frame The best quality sleeper sofas have three rotation coils; poorer quality sleeper sofas have only one. For quality, you should check the decking fabric located just below the cushions. The decking fabric should be made of tough and durable material to protect the cushions from being torn by the flat springs. Other characteristics to consider are: does the mechanism work easily, smoothly, and quietly? Is the sofa well balanced in each position when the.
