Select Comfort has got your number. The firm's line of Sleep Number beds, which can carry hefty price tags, use air-chamber technology to allow sleepers to adjust the firmness on each side of the mattress, providing better sleep quality and addressing sleep-related problems, such as lower back pain. Select Comfort also offers foundations, frames, pillows, and a sofa bed. A leading bedding retailer in the US, Select Comfort operates nearly 490 company-owned stores. The air-bed maker also sells through a company-operated call center, its own website, and on the QVC shopping channel. Select Comfort was founded in 1987 has grown to become one of the nation's leading bed makers and retailers.