These sheets stay on and don’t pull away from the mattress because the gathering of the elastic is tight and wide and the extra elastic cross brace on each corner is wonderful. Also, we don’t have a really tall mattress and so the fact that they had a sheet that fits up to 14” mattresses was the dealbreaker for me even if these do cost more money. It is so hard to find sheets that fit my bed. So many Fitted sheets have this “fits up to over an18 inch mattress” category that’s ridiculous, especially when not everyone has an 18 inch mattress. I got the percale fitted sheet (that’s all I needed for now because my last fitted sheet got a hole in it ) and so far it is fine. I do like sleeping cooler so hopefully I’ll continue to like it. It isn’t as soft as my old one but that’s fine for me and they said the percale will get softer with several washes.