The fem cap acts as a barrier between the sperm and ovum and is only available online
FemCap
A FemCap is a silicone cup that is inserted into the vagina to act as a barrier to sperm entering the cervix. The FemCap has a tighter fit over the cervix than the traditional diaphragm and can be used by women who have given birth. The FemCap comes in three sizes and manufacturers recommend using spermicide with the FemCap to increase effectiveness. Before considering the FemCap, users need to be able to locate their cervix and feel comfortable touching their vagina.
ISHS does not sell the FemCap. It can be ordered directly from the manufacturer’s website here