I have Twin-XL bed mattresses, one which has an additional 3" foam topper on it. Finding twin-XL fitted sheets that go around the mattress edge are almost impossible to find, because most are only made to fit 15" mattresses. These Pima Cotton Extra Deep Pocket Twin-XL sheet sets worked exactly as they were described....the fitted sheet deep pockets have lots of room to fit over the edges and stay on mattress, plus these sheets are very soft. This is the second time using them after being washed twice and, if they shrank any at all, it is not noticeable because the fitted bottom sheet still hugs around the mattresses perfectly. The top sheets are extra long so they do not get pulled out at bottom of mattress during the night as so many other sheets I have bought did in the past. Highly recommend the sheet set regardless of bed size. You will not be disappointed.