Sheets are silky and cool.  Material is thin, which is neither here nor there.  That accounts for my 2 star review.  Where these sheets lost stars is in the fit.  My mattress is 16" high, and what a pain to get the sheets on:  pull and tug, yank and pull!  For the first few days the sheets stayed on, but for whatever reason after that they started to pop off the mattress in the top corners.  There is no way these sheets would fit a higher mattress than 16", and I wouldn't even buy them for a 16 inch.  I've since bought better fitted sheets, but will use the flat sheet and pillowcases.