For years I have bought another brand of sheets that fit my super-thick mattress perfectly, however the last two sets were of lesser quality and the fitted sheet ripped on both sets quite easily from my dog's claws. Having lots of flat sheets and pillowcases leftover, I decided to purchase only a fitted sheet and chose the Grand Luxe Egyptian Cotton Duetta. Oh my gosh is it SOFT. I've always bought thicker, heavier sheets, and never knew what I was missing in the "softness" department. It was soft right out of the packaging, and remained soft after I washed it. It fit my mattress (16" thick) perfectly, and I didn't have to readjust it in the morning. I was going to give it 4 stars, because I really don't know that it'll be durable because it isn't as thick as the ones I used to buy, but I went with 5 stars because they're MADE IN THE US!! That was the clincher, and regardless of durability, I would buy them again for that reason only. It even came with a "thank you" card from the company for buying a US-made product - a classy touch.