I was very skeptical about buying sheets for my sleep number bed with the full split because the sheets are notorious for sliding off the corners. These sheets are wonderful they do not slide off, wash well, and look good. They are not as soft as I like, but I hope with each wash they soften up more.We ordered the Burgundy CalKing sheet set and at least for that color, it was a good match for the view onscreen my computer. The sheets themselves feel very nice (they are 600TC as described in the supporting text, unlike the caption which says 550). We have only slept on them for one night, so cannot comment on their durability, and they do not feel like micro suede, but rather nice, smooth normal cotton sheets (and that's without any washing yet). They certainly will fit a deep mattress and the price is very reasonable for this size set.We had ordered some other sheet sets several months ago from a different site altogether that advertised similar thread count at a somewhat higher price than here, but what we got was something that felt almost like plastic and was far too large and did not fit our CalKing mattress at all well. Ordering sheets online can be a problem, but so far I have to say that sheetsnthings did a good job and we will be ordering more sets from them in the near future.With only two reviews here and such a divergence of opinion of the existing reviews, all I can say is that I have always given my honest opinion in every review I have posted and I received no compensation of any sort for this review. If with time my experience or opinion changes about this item I will post an addendum.These sheets were similar to what I bought from Bed Bath and Beyond a number of years ago, but these more than $20 cheaper TODAY through Amazon. Can't complain about that!I absolutely love these sheets, they are so incredibly soft and probably are the nicest sheets I've ever owned. They seem to be very well made and good quality so very well worth the price. I got the green damask striped and I love the shade of green, very hard to find the right shade of green sometimes especially in damask striped sheets. I would definitely buy these sheets again.Bought the Cal King Flex Split to replace my 2nd set of Sleep Number bed sheets that ripped (not on seam) probably because they were such an overly snug fit. Like these so much better since they are oversized for my mattress. Love the Sage color too. Stitching quality is excellent. Plan to order another set in another color since it is half the authentic Sleep Number sheets.I'm trying to match 100% cotton sheet set I bought at a thrift store, believe it or not!! They are marvelous & so wonderful to sleep on! They were $30 for all 4 pieces of a queen size sheet & 1 of God's miracles I've been trying to match. They weigh about 8 poundsbut since I use they a lot, they are wearing out slowly but surely. Thanks for them.sThese feel great. It was a good anniversary present to ourselves. Gotta have all cotton!Very nice sheets.