The Today Sponge offers women effective 24-hour protection against pregnancy. The Today sponge offers a combination of barrier and spermicidal protection in a convenient package that allows spontaneity in sexual intercourse for over 24 hours. How does it work? The sponge contains 1000mg of Nonoxynol-9 - an effective spermicide. It is inserted into the vagina against the cervix to form a physical and chemical barrier between sperm and the uterus. Because Today® Sponge is made of soft polyurethane foam that mimics the feel of vaginal tissue, it is extremely comfortable and generally undetected by either partner during intercourse. Always read product information before use.