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From the SleepBetter Recommended Products page:
Carpenter Co., the creator of SleepBetter, is the largest manufacturer of comfort cushioning in the world. Since 1948, our focus has been on quality, technology and comfort. We manufacture a wide variety of products that can be found at national retailers such as Bed Bath & Beyond and JCPenney.
Most SleepBetter products are pillows and mattress toppers, but they do have at least two mattresses. See the Carpenter Co. page for reviews of Sleep Better Mattresses.