"The cups have undergone 3 year wear tests and in that time frame no differences in material were noted. It is possible that depending on storage conditions (no direct sunlight) or care the older cups may be less resilient than cups less than three years of age. No testing was done past the 3 year mark. (testing is expensive and most competitor products like sckoon only test for 2 years) "
I ordered a second one after that, because I really liked the ring stem. Well it's been 3 years since I bought that one, and it also has become soft with difficulty opening. I should mention, after every cycle I soaked the MeLuna in hydrogen peroxide and then boiled it before storing. (In case that had any effect.) I wish more companies would use the ring stem. So now I got a Diva Cup and what a difference in the springiness! I just don't think the hollow stem was a good idea in terms of ease of cleaning.