I have a Cal King mattress that is very deep and this bottom sheet fits great. Most stop about halfway down, but these cover the entire mattress. The top sheet is not oversized, so I can't tuck in the sides, but I'm okay with that. It's very long so I tuck it in at the foot of the bed. These sheets are very soft, but as one reviewer noted, they have a soft and a rough side, so putting the top sheet soft side down is essential. They are a little heavier than what I like for summer, but they seem well made and are very comfortable to sleep on.