Based in Southern California, David Raminfard serves as president of KasLen Textiles, which offers clients fabrics of a wide range of styles and types, with uses from drapery to upholstery. One quality differentiator among the products David Raminfard distributes is thread count, which describes density of threads within a square inch of fabric. In essence this is a measure of tightness of weave, as it calculates the total of widthwise (weft) and lengthwise (warp) threads within a given area of fabric. A 200 thread count fabric will have 100 weft threads and 100 warp threads within each square inch. In practice, thread count is often secondary to quality of yarn in defining the comfort of the fabric. With sheets, higher thread count sheets tend to feel softer and offer a more comfortable sleeping experience. A plain-weave sheet is typically in the 180-200 thread count range, while average sateen weave sheets are in the 250-300 range. Keep in mind that quality sheets can be within a 200 to 800 thread count range, depending on the yarn used, weave type, and production process,. Accounting for all these factors, a thread count of 400 may provide the ideal combination of softness and breathability. Once in the 600-800 range, airflow may become stifled which create a heavier and warmer fabric.