This foot makes sewing straight stitch seams in thick, hard fabrics and straight stitching over thick seams possible. The single needle hole provides extra stability for the needle even as it crosses thick bulky areas The narrow groove in the sole of the foot, behind the needle, allows heavy threads to pass under the foot, preventing skipped stitches when topstitching Use this foot in combination with a size 100 or 110 when sewing thick, dense fabrics (as when hemming jeans). This foot is uniquely designed to actively brace a size 100 or 110 needle and help prevent needle breakage when sewing through heavy layers Jeans Foot #8 can also be used with a size 70 ballpoint needle to sew fine knit fabrics without puckering and wrinkling.