I ordered these sheets in blue for my king size bed. The fit was perfect for my pillow top mattress. They stretched over the corners and stayed in place with plenty of room to fit the thicker mattresses without any issues The navy blue color has a tint of grey to it. I have added photographs, so you can get see that it is not really a deep navy blue. With that being said, it goes perfectly with a navy blue bed assemble or any nautical or sea house theme room. I like the color blue because it is very relaxing in the bedroom. The sheets are made of a polyester blend that is very soft and soothing to the skin. It makes you want to cuddle and not want to get out of bed. In my opinion it is a good quality product for the money. The only thing that I didn't like about the sheets is that they are not wrinkle resistant. As you can see there are always creases visible to the eye. Also, you must wash them separately in cold water and dry them in low temperature to ensure that they matain their color and they last you a while. I personally recommend this product for it's price, comfort and quality.