I have about 5 pairs and they barely leave my feet from September through to May. They are virtually indestructible and perfect for beach to town, to and from work, to walk round cities, any weather...
I've walked up a mountain in Canada in slim pair (plus crystal stud). Not by design but more because we went for a quick stroll and it ended up being a full on hike!
They can be a little uncomfy and rubby to start with but they will soften up after a few wears and be your best friend
They are rubber but don't make your feet hot or sweaty.
Only think I will say. My first pair lasted an eon. Maybe 7 years of use. Now they tend to 'bust a plugger' within a couple of years but they still limp on in our house as deck flip flops or beach only flip flops. I think they've gone down in quality over the past 10 years as they've got more popular and churned out in bulk