I wear a WOMEN'S 8 but purchased the YOUTH shoe in size 6 1/2 (because ORANGE was not available in women's).  The fit is perfect and they have all the advantages of minimal running yet do not require a ton of break-in time like some other minimalist running shoes do.  The muscles in my legs are adjusting smoothly without a serious cut in mileage.  Only complaint is the seam across the top of the shoe is quite rough on the inside and would cause blistering were I barefoot, so I am not able to wear these without socks.  But with a pair of thin wool socks these run like a dream.  And I LOVE the orange/black combo!