The one thing a shopper cannot do online is try a piece on, so Nord treats a size that is off as the store's problem, not yours. A size exchange on an unworn item ships at no additional cost within the thirty day return window: tell us the size you need, keep the tags on, and the replacement goes out when the original is on its way back. To make a second exchange unlikely, every product page lists full garment measurements and a fit note, so you can compare against a garment you already own before choosing the new size.