HavaianasSlim, Stylish, Durable and Versatile Flip-Flops, with Textured Sole for Grip and Support, Women

What is size be?

I am not sure what size I have to order. In my sneakers I wear woman's size 8,5. I am just confused..why is the men size stamped on the flip flop?

Do the sizes run big or small?

Can you order a bulk amount