Pockets are the deepest I have ever seen. You will easily cover the mattress, boxspring, and whatever else you have on the bed with the fitted sheet--just absolutely huge. For instance, I have a 17 inch mattress on an adjustable base which is an estimated 4-6 inches, plus a 3 1/2 inch gel and foam mattress topper, plus a 1/2 inch padded protective covering on everything. That's about 27 inches altogether. The fitted sheet easily fit over all of that, and have not worked loose off the bedding one time. Quality of the sheet is very high. I am totally pleased. Only minor issue (in my case) was the color seemed to be a bit different than what I was expecting. I thought I would get a sheet the color of the sky, but, instead it was a darker color blue. This was not a big problem for me. I wanted sky blue sheets for a brighter summer looking appearance for the room. This sheet is warmer in color and makes the room sedate. That is just fine.