Well, I guess I don't understand 'thread count' when it comes to sheets.  I assumed that the sheets were so thin because they had only a low thread count.  I
am sure these sheets will be very nice in the summer; however, I would like to get some sheets that are heavier -- somewhat like sheets were 50 years ago.
I also get frustrated with the bottom sheet and the corners that need to hug the mattress.  Unfortunately, my mattress is only 12" and most of the sheets I
have looked at require at least a 15" mattress.  I like to get in bed at night to smooth sheets, but that hasn't happened for quite a few years.  Other than 
getting a new thicker mattress, I just guess I have to tolerate it.  I do like these sheets considering these two facts; however, I'd rather have sheets that were
a bit heavier and that snugly fit the corners of the mattress.