It is an easy & effective way to alter your favorite clothing by stretching. Never need cutting or sewing. Waist band can be stretched up to 5 inches. Works perfect for waist measures 22"-50". Waist band will remain stretched until its next washing. Works on most fabrics such as Cotton, Denim, Linen, Polymer. This Waistband Stretcher is New In Box. Not recommended for silk or wool