We purchased a split king set on a special offer of buy one get one. The fitted sheets fit snug and have special straps at corners to keep them securely in place. After one wash and a week of sleeping on them, there's not been much movement on the mattress. The flat sheet is a great length, but the width is a little too short what I consider a good width. They only fall about 4 inches on each side of the split king mattresses. The feel of them was initially soft, but after washing them strangly seem less soft. They are still very comfortable. Not sure I'd pay full price, but worth the special offer.