【Doesn't Shake, Excellent Fit!】 AOY's running pouch uses highly elastic material in the pouch section, also used in scuba diving wetsuits. Furthermore, the adjustable rubber band fits snugly against the body, achieving "reduced shaking." It provides stability without shaking during training, allowing you to move without stress. The excellent fit allows for comfortable training. 【Water Bottle Pouch Design】 Comes with a pouch to store a water bottle. It's adjustable to fit various water bottle sizes. It can be used as a waist pouch, and the water bottle pocket can also store small items when not in use. It's a very compact and convenient design. 【Adjustable Belt】 The waist length can be adjusted from 65-140cm, allowing for a free fit. s28-17-17.