I'm looking for a cup with no grip rings. I'm very sensitive to BV and it seems to only flare up on my period and all itchiness is isolated to the bottom of my vagina, where grip rings are. It's worse with cups I've tried that have more pronounced ridges, so I'm led to believe this encourages a nice clingy place for bacteria to flourish :/ boiling of course helps, but I would have to do it twice a day to ensure I can get through my period without a flare up.
All that to say: if you can think of cup brands with no grip rings whatsoever (or whatever design), I would greatly appreciate it! So far, I've come up with: Si-bell Lady cup Lily cup