The waist trimmer belts are made from lightweight neoprene for flexibility, comfort, support, and durability. It conforms to your body shape so that it can be worn well under clothes. Wearing the belt will help you remember to keep your core engaged and head to the gym after work. You will exercise and keep your core tightened, which can help you see a difference in the size and shape of your waist. The belt is ideally comfortable and lightweight so that you do not feel any discomfort while wearing it. It is wide enough to cover the stomach area and stays in place while exercising. The belt should only be worn during exercise for no more than 2-3 hrs at a time. Before you begin exercising, adjust your Waist Trimmer to the desired position and wrap it comfortably around your abdomen