@batjamboree , you can get both firm and softer flexible in both silicone and PVC, just knowing the material won’t tell you how it feels as the make up of both can vary hugely depending on how they’re made. It really is just reading descriptions and reviews that will help with that. If I want to know more details, I generally search for a review written by a forum member name I recognise and ask by tagging them directly either in What are YOU contemplating purchasing next? or in a separate topic (like this one). When I have done so (and obviously it does rely on there being a regular forum member review) people have been really helpful. I’m sure @rockstar can help with the details of that one, though.
@AJSTAR , generally porous PVC, not great for hygiene. Okay, if you can boil them to sterilise them, though.