Here's The Dealio for Sizing
I love these. I am an 8 Wide officially. Have been my whole life and confirmed multiple times. I am a petite woman whose feet just run wide and have high arches. These are ideal. I ordered the size 8 and they fit perfectly... unlike the Wren slippers who are made just for narrow-width people. (I ordered a pair of those in 8 and they fit sooo tightly that I had to order a 9.) Usually, I get away with ordering a 8 1/2 in Medium for regular sneakers (Rebok, Sketchers, etc.) and the like. So far, for Overland, I own a pair of Emma's, Alyssa's, Lily's (out of production) and the afore-mentioned Wren's. The first three fit perfectly in a size 8. For the Wren's... maybe they learned their lesson and that's way the Wren's are on sale... stop making boots in NARROW!!!! It is VERY frustrating for people like me who have a bunion and whose feet are naturally wide...even though I'm only 114 lbs.! Wide feet exist and they deserve respect and acknowledgement. Narrow width people can deal with a pair of shoes whose widths are more generous, however we wide-width people cannot deal with narrow-width shoes. Stop making them! Anyway, these (the Alyssa's) are great.