Select Comfort Beds ebook for Windows. Excerpt: Because the Sleep Number Select Comfort Bed is so heavily advertised, it's a well known product and one of the best selling mattresses in the United States. Select Comfort has a 24-hour website, full-service customer sales telephone line and over 478 retail locations, all selling their products. But, does it work? For a high-level overview of the pros and cons associated with a Select Comfort bed, keep reading.