Until recently, Sue Chiang, 42, had never heard of Firemaster 550. Five years ago, she grew worried that her old, dusty couch would cause allergies, so she sold it. She and her husband bought a burgundy microfiber sofa at J.C. Penney and plunked it in the living room of the Oakland house they moved into in 2008. The couple's two kids, a 4-year-old boy and a 2-year-old girl, watch TV on it and build forts with the cushions. When they go to bed, Chiang and her husband sit on it and work on their laptops.