The couch my wife and I have at home is aesthitically appealing, but very uncomfortable to sit in for long periods of time. There are many different types of lumbar cushions/pillows that are sold but many of them are designed to be used in car seats and office chairs - but not designed for use with a home sofa. Can anyone recommend a good lumbar pillow/cushion to be used with a sofa at home to make it more comfortable and prevent back pain?