The colour is more blue--and stronger-- than what is shown online.  I wanted a softer more green turquoise.  I have no idea what the thread count is supposed to mean--I think it has become meaningless.  These sheets are nothing special--no piping or special stitching detail on the pillowcases, which of course have seams on both sides.  The labels on the sheets do not mention cotton--and the fabric feels more like a cotton/polyester blend.  But they were a compromise, since I couldn't find what I really value on any website.