RykaDEVOTION XT Athletic Shoe

Are these waterproof?

If you click on the one that says black it has a Purple bottom but I received a totally different one. Is this a mistake or is there one that is black

is the footbed at the arch a solid piece or two piece contruction

I'm a 7.5 in Adidas running shoes, should I get a 7.5 in these or 8? I've seen some people saying ryka shoes can run small.