Allergies, colds and the flu can cause sinus congestion and coughs. Our shower bombs help open your sinuses so you can breathe better. Simply place one near the drain in your shower and turn on the hot water. As the bomb melts it releases eucalyptus essential oil and menthol into the air while you shower. These are formulated for shower use only (do not use while taking a bath). They come in two sizes – large for adults and small for children. Only use the small size for children.