Adjustable bands are flexible straps or loops that can be modified to fit various sizes. They are commonly used in products like watches, fitness trackers, and clothing. The ability to adjust the band ensures a comfortable and secure fit for different users. These bands often feature mechanisms such as buckles, Velcro, or sliders, allowing for easy resizing. Adjustable bands are popular in many industries, including fashion and sports, as they accommodate a wide range of body types and preferences, enhancing usability and comfort for the wearer.