Menstrual sponges (also known as "Sponge tampons" or "Sea sponges") are an alternative to tampons or menstrual cups. These are sponges that are inserted into the vagina to absorb the blood, then rinsed out and used again. They are used moist, making them soft and comfortable to insert. Sponges are reusable, but not long term. In constant use they will last around 6-12 months. When they start to tear they should be replaced.