REEFSmoothy Men's Beach Flip Flop, Soft Woven Strap Made From 100% Recycled PET

What’s country are these manufactured in?

Is there a break in period? My left foot is smaller and the arch support lands too far down. Feels like I'm stepping on something

I just purchased a pair of men's reef sandals and are to small, don't know how to return for a larger size, came with no paperwork.

What fabric is between the toes