I bought this sheet set in a beautiful aqua color for my twin size extra long adjustable bed. I am very happy with these sheets. They are lightweight and cozy. And the 700 thread count makes a nice, soft feel. I needed deep pockets so the sheets would not come up from under the mattress when I adjusted the bed upwards (both upper and lower parts). I went the overkill route. My mattress is about 12.5 inches deep, and these sheets go way under. I probably don't need all of the 21 inch depth of the bottom sheet. Next time I will get about 18 inch deep sheets. But I highly recommend these lovely sheets.