I ordered these for my daughter who said she was a size 8.  So, next to the pic it asks what size you are wearing in your present sneakers. Her Nikes said 8.5, so I filled that in.  The result was that I would need the same in this shoe.  Nope!  I should have listened to daughter.  The 8.5 in Nike is NOT the same as 8.5 Adidas.  She has enough room to have ordered an 8, but she was leaving the states and didn't have time to return them & get them back before departing.  So, you may want to order 1/2 size down. But, she LOVES them!