I read the reviews before buying these sets and took the chance they would not fit. Someone said they didn't fit. These fit so well they tuck under all the way around the mattress at least 4 inches! I have a queen size padded mattress with a 3 in memory foam topper. I have never bought a fitted sheet that has an 1 inch wide elastic band all the way around the sheet. These sheets are awesome. Soft, thick and fit my extra deep mattress (20 in). These sheets do not come off until you take them off. Now I can buy that 4 inch memory foam topper! I am buying more of these sheets right now. If you have a mattress up to 21 inches deep you won't be disappointed in the fit.