I ordered these sheets in the Navy and they emitted a chemical odor that I was unable to get rid of thru washing and airing out.  I contacted Customer Service and I give them an A+....they immediately sent me a replacement set of sheets, but unfortunately I had the same problem and they have been sitting out in my enclosed porch for over a month...the odor is still somewhat present.  Some people would probably still sleep on these sheets but I have migraines triggered by chemical smells so I absolutely will never use them.  I think the chemical odor may be coming from the plastic packaging being absorbed by the cotton sheets.  But, putting that problem aside, I would give the sheets a 3 star rating because I didn't think they were very soft for 400TC.  To be fair this is the first time I've ever been unhappy with any of my purchases from Wayfair and I will certainly continue to shop here.