Purchased at a department store, worn 1-2 times. I no longer need it, so I hope someone can use it! Approximate measurements (laid flat): Width: 45cm Length: 55cm Made of a very soft, high-quality mesh material with a nice firmness. The neckline has a zipper, making it easy to put on and take off, and allows for comfortable temperature adjustment. Suitable for running, walking, and various other activities.