Higher thread counts are not always better, nor does it indicate quality. Higher thread count wovens are most often achieved by using thinner, less-wound threads (packing more threads into that square inch mentioned above). Doing this can cause less stable woven fabric that is more susceptible to wearing out faster. The most recommended thread counts are between 200 and 400. The Cool Luxe sheet set is a 300TC that uses a single-ply yarn.