Acorn brand Sizing Information
Some Acorn Products are sized normally, using whole numbers. Others, such as some of the slippers are small, medium, large, etc. For example, the Women's line of “Oh Ewe” slipper runs from an XX–Small to a Small, while the unisex “Sheep–On” slippers run from XX–Small to X–Large.
Acorn boots tend to be a little wide, but still are snug. Acorn slippers are a bit more on the loose side as well, but more flexible than the boots because of a flexible comfort sole. It's normal to experience some slippage on your heel with Acorn slippers. Even in their textured Moc which has a back on it wrapping around your heel.
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