If you are a mouth breather, then you may find success using this chin strap. It's purpose is to hold your jaw closed while still getting a comfortable night's sleep. It is adjustable so it will fit many different facial sizes and contours. In addition, because it offers support around your whole face/head, your mask will also be more secure. The chin strap is offered in both black or white. Please see your sleep specialist because this product works best with certain mask types.