I wont claim to understand the technology or construction that goes into these sheets but I will continue to use them. They somehow walk the tightrope between cold to the touch and stifling hot underneath.  They seem to maintain the perfect sleeping temperature and breathability. They are also ultra soft even for this threadcount. No pulling or binding and not a rubbing edge to be found anywhere on them.  I plan to buy a few more sets for my kids as they are fussy about their bedding.  I put my set on one of their beds and they dont want to give them back.