You use seam band to strengthen the seam of thin and stretchable substances. You use it before sewing the two parts on top of each other, because the seam is then easier to process. For lapel lines, collars, fault lines and chopped decorative lines, in the seams of stretchable fabrics (jersey, cotton) and to the intact of bags and folding lines of hems and splitting. Also useful for better implementation under the sewing machine of leather, suede and imitations thereof, and with paper -thin substances. The seam band is flexible and thin, and can be squeezed well