This is a running pouch from Adidas. It's the type that you wear on your arm. The length can be adjusted with the belt. It's a tightening type, so you can fix it to your arm and run. I'm selling it because I don't use it. Thank you. Track and Field Sprint Middle Distance Long Distance Hurdles Marathon Running Jogging Sports Carbon Maxfly Air Zoom Victory Victory Dragonfly Prime SP2 Ambition Avanti SD-X Metaspeed SP Metaspeed MD FuelCell LD-X Cosmo Racer Metaspeed LD