Why are women and men's shoe sizes different?

We are trying to design shoes on line my son wears a youth size 6.5 what is this in mens sizes

shoe size Men's 12 = xl? shoe size Men's 10.5 = l? very confusing in shopping for men's slippers when store is asking what si...

if a women is a size 5 in shoes...what size is she in kids ?

if you wear a girls youth size 5 what size would you wear in women's shoes?

Hey, can someone help me find these shoes in a size 9 womens??? please! they are: Dunk High Premium SB Metallic Silver Nike

So im a girl but i wear a size 5 in mens vans so what size shoes whould i get in womens TOMS? haha

i have looked on literally every website and cannot find a pair. size 4, red authentic vans? please help me!

What is the equivelant of a boys shoe size 12 to a mans shoe size ?

size 6 in youth, what does it convert to mens size

im a size 5 in mens vans so.. what size should i get in toms??