REEFPhantom mens Flip-Flop

Leather or Not? Conflicting information. In description it says Synthetic Upper. In Featured & Details it says Leather.

Is it better if these fit a little tight at first? Do they stretch much as they break-in?

wear 11 ee what size should I get?

Shoe size is 10.5 eee will the size 12 be wide enough? will it be way too long?