Nothing these days is truly failsafe. You buy some Ultrathins and the babies might win, even the Trojan horse had issues for the boys of Troy. Fancy ribbed models can end up in shreds & I've seen the reservoir tips burst. But if you're still ***** & thirst for safe ***, you should try different combinations of tubed-latex along with 'the pill' dispensed from the fancy circular monthly-packages. That's your best bet, your best chance of survival. If anything, don't be a dinosaur thinking your living Jurassic, this is about being prophylactic 'cause nobody knows what killed those ornery unprotected beasts. The experts believe, it was probably a rare disease that got 'em.