The Diva is a silicone version of the The Keeper. If you go to thekeeperstore.com you can find both. I have used the The Keeper for five years and developed an allergy to latex (Keeper is made of real rubber). I swear by it. I, too, had the same problem with tampons; it felt like I was pulling my guts out when I removed one. The Keeper and The Diva are absolutely awesome. Plus, the money you save from buying tampons will buy you at least a new jersey and shorts per year.

Anyways, to answer your question properly: they are menstrual cups. All you need is a panty liner when you are having your period, well, that and the cup. They are washable. Comfortable. As far as getting used to it, I liken it to getting used to contacts. A few days and you'll be an old pro.

I don't normally go on and on about a product, but I truly believe in this one. Back when I was endurance racing with horses I learned about the cup. I would spend four days a week, 70 miles from home, training two horses for endurance, not to mention thousands of miles on the road, and in the saddle. If it weren't for the cup I'd have to take a whole week off.

Oh, and if you get one, they have this little stem at the end...cut that off, it will only irritate you and get in the way.

As for the difference between latex and silicone: I've found the silicone to be a bit softer and more comfortable. Also, one thing I'm learning from nursing school, latex is as much a problem as insect stings when it comes to anaphylactic shock.

They cost about $25 - 35 and last about ten years.