Tread count is measured by counting the number of threads contained in one square inch of fabric, including both the length (warp) and width (weft) threads. The thread count is the number of threads counted along two sides (up and across) of the square inch, added together. Thread count is a measurement of the coarseness or fineness of a fabric. Thread count is often used as a measure of fabric quality, so that “standard” cotton thread counts are around 150 while good-quality sheets start at 180. Some, but not all, of the extremely high thread counts (typically over 500) tend to be misleading as they usually count the individual threads in “plied” yarns (a yarn that is made by twisting together multiple finer threads). For this reason, a fabric with 250 two-ply yarns in both the vertical and horizontal direction could have the component threads counted to a 1000 thread count. However, the National Textile Association (NTA), which cites the international standards group ASTM, accepted industry practice is to count each thread as one, even threads spun as two- or three-ply yarn. This is why Quagliotti states a thread count of 300 for their high quality linens, counting the threads in a correct way.