We purchased a split king sheet set when we purchased our Tempur-pedic mattress and were satisfied with it except for permanent creases being in the sheet borders. I took it back for another set, but the 2nd set had creases also. I've had to iron the sheet border every week and it became tiresome. I checked a lot of venues for another sheet set, but was not satisfied with the dimensions, the quality, etc. So I took a chance and purchased another set of Tempur-pedic sheets like the first. I had to send the flat king back because the hem on one edge was not sewn properly. I called and was sent another one which was perfect. The quality of these sheets is unsurpassed by any! We love sleeping on them. I wish I could have resolved the problem with the first set. I still use it for a bed change, but wish I didn't have to iron the borders! However, the second set is wonderful!