we purchased the tempur-pedic mattress, but continued to use the sheets that we already had (which were for a pillow top mattress). King sheets are so expensive that I didn't want to replace what I didn't need to. The tempur-pedic sheets were worth the $$$. The fit and comfort level of the fabric compliment the mattress perfectly. Much more comfortable. It would be wonderful if the tempur-pedic folks could see fit to have mattress covers and sheets a little more reasonably priced since the mattress purchase is a pretty big investment initially.