Imagine Xing as shoe dealer (size numbers are american)
"Im realy sorry sir but we cant make you shoes smaller than number 38 because it ruin design of printing on them... yes sir we can make those printings smaller too but it is too much work, it is easier to make shoes only in nummber 38 sir. Enjoy a lot of space around feet and imagine how much fresh air circulate around your feet in our oversized shoes"