It has been opened. With a design approximately 2mm thick, it's easy to put on and take off, and it fits snugly against the body, optimizing the feel against the skin. The neckline is shifted downwards, preserving the collarbone line, which is located in the middle of the collarbone and Adam's apple, while alleviating the feeling of tightness around the neck and the stuffiness of summer, combining both discretion and comfort.