Bought 8.5 when I am a true 7.5, this  based on feedback from others here. Glad I did. Tried them on with thin socks and thought they were lose. Put my smart wool thick socks on and the boots fit perfectly. Super comfortable. Best comfort from a boot I've ever had! Likewearing slippers. Not as trendy and cute as I thought they looked in the picture. Probably should have gotten a different color for the trained factor.