HavaianasTop Men's Flip Flops, Black-curve

The sizing on this ad is so confusing. i cant tell if these are men or womens sized shoes. i wear a womens size 8. what size should i buy?

I'm looking for the heavy rubber on the bottom like the ones from mexico called calzaletas. they were bullet proof. do these have that heavy rubber?

Is there anyone else with an unequal walking pattern who can comment on the comparative durability of these flip flops for your situation?

How do these flip-flops ship? ( In a bag, shoebox, etc).