Waist elastic. These are Ion stretch pants. They're very easy to move in and comfortable to wear. There's also a 150 size in a different color. The waist area is a bit faded, but they still seem like they'll be great. - Color: Denim - Size: 140 - Material: Denim-like fabric - Design: Elastic waist, with drawstring - Pockets: Front pockets Thank you for looking.