REEFOrtho-Spring Women's Flip Flop, Arch Support and Soft Cushion Footbed

Are these authentic reef sandles? I have a pair just like them I would hate for them to be knockoffs.

If you have shorter toes, would you size down a full size? I’ve often found the need to do this, with orthotics, or I have a lot of space at front.

Why does it take 2-5 weeks to ship ? Are they on stucked ship

Are they good for flat feet?