Denim with an elastic waist Waist adjustment button included I washed it after purchase but it was too small before I could wear it. Thank you. - Size: 140 - Material: 72% cotton, 19% polyester, 8% rayon, 1% polyurethane - Color: Navy - Design: Elastic waist, slim fit #MUJI #TheNorthFace #Patagonia #Montbell