Undercover Mama functions as an undershirt, keeping your back, sides and belly covered as you nurse. It has no straps and attaches directly to the outer flaps of any top-opening nursing bra. Undercover Mama remains attached while in use. You will feel like you are wearing a regular cami under you shirt, but when you need to nurse you still just have to undo the flap on your bra and Undercover Mama opens with it- No extra flaps or hooks to deal with each time. Undercover Mama's generous length make them great to layer under your shirts and allow you to nurse comfortably.