Is the leather under the cross bands, that is, under the cross bands that touch your fingers and the metatarsal bone, artificial leather or genuine leather? Because artificial leather gives me allergies and makes all my skin swell, the doctor prohibited it due to allergies. The inside, outside, bottom lining, and all of the shoe, except for the polyurethane part, need to be genuine leather, in summer sandals. Can you also explain the expression 'come out leather'? What does it mean? Thank you very much. Good luck.