These Boy-cut shorts were knitted in a highly stretchable fiber to conform to your body's measurements. A 6" negative ease was incorporated in the stitch count, which is given for Small, Medium, and Large sizes. Substituting yarn for this garment is not recommended. Cascade Fixation is 98.3% cotton and 1.7% elastic. GAUGE 6 1/2 and 10 1/2 sts. = 1" SIZING / FINISHED MEASUREMENTS low waist measurement 31 (35, 39)"