Four aspects can be used for identification of woolen sweaters. First, Appearance: Sweater surface should be flat with a sense of woolly aspect, the needle should be clear, no obvious uneven yarn, no unproportional in thick and thin, no neps, no thin and dense needles here and there, no pattern misprint, no stains and ironing defects. Otherwise bad. Second, Rib: Plain cuff rib, bottom rib, straight rib cuff and rib collar, no loose, no wrinkle, full of feeling with warmth, good elasticity. Otherwise bad. Third, Color and Lustre: Bright color, pleasing to the eye (good looking), pure wooly hair or wool blended sweater with a soft glances, same color in all parts, no obvious shade difference and stain, vice versa, bad quality. Fourth Stitches: Strong seam stitches, even stitches, straight stitches, no leakage and obvious defects, i.e. no slight holes, these are quality products. Vice versa, bad quality.