range is currently possible using a circular knit fabric formed on a 36 38 inch diameter machine although higher levels of spandex in the performance fabric tend to pull the width in in just one example on a 30 inch diameter machine the spandex can reduce an otherwise 94 inch circumference fabric tube to one with a 60 65 inch finished width a major limitation in finished width is not strictly a knitting concern but also concerns finishing with performance fabric it tends to sag in the middle u2014 increasingly so with greater widths u2014 making finishing difficult to impossible above a certain threshold a possible 90 inch finished width is contingent upon having a good finishing set up capable of handling the present performance fabric this potential for difficulties would only become compounded at the larger widths required for bed sheets in a preferred process the present fabric undergoes a heat setting finishing process applying a moisture wicking finish to another fabric u2014 like cotton u2014 that can be produced at larger widths appears unlikely to match the moisture control properties of the present fabric as polyester itself is naturally moisture resistant and there are physical actions e g capillary action at play further the use of cotton comes at the expense of breathability and heat transfer capabilities as confirmed by laboratory testing and stretchability numerous characteristics and advantages have been set forth in the foregoing.