BirkenstockMadrid Brown Womens Sandals Size 40 EU, brown, 7 UK

i'm 37.5 eu size normal width which size to buy 37 or 38?

Is this the regular width or narrow and is size 9 women size or men

Is the “ brown” leather or birko flor?

Does anyone know what size these are? are they a us 5 like the to title or are they a uk 9 like the description?