I ordered the shoes in size 6, because it is said in the description of Tauchsport Heinemann, which is size 38. I have a wider foot and therefore usually wear size 5 1/2. the shoes are wide enough, but unfortunately a bit short. The big toe pushes to the front.
My request for exchange was friendly answered. I can return the shoes at my expense, and place a new order. That's fair to the new legislation, but for me so angry that I have to rely on the size specification of the Seller.