I have a Sleep By Number Bed (Big mistake!) and SBN sheets that are suppose to fit perfectly and they don't but my Tempur-Pedic Sheets DO! I love the softness, the perfect fit with the elastic straps to hold all the corners in place and they wash up beautifully too. Love, love my Tempur-Pedic sheets! I would trade my SBN bed for a Tempur-Pedic in a heartbeat! I made the mistake of trying a SBN bed after having a Tempur-Pedic ...BIG mistake! Now I'm stuck with an overpriced bed I don't like. Tempur-Pedic I will be back!