The measurements of the size chart above is based on the cross referencing to several international size charts available on the internet as well as personal experience/measurements.
Below are a few FAQ questions when it comes to sizing, please see if I've answered of your queries.
Otherwise, please leave a comment or ask via the Formspring account.
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Q: What sizing are your shoes based on?
A: Our shoes are based on EUROPEAN (EUR) sizing.
Q: How do I measure my feet size?
A: For length, please use a measuring tape to measure from the tip of your longest toe to end of heel. For width, please measure widest part of your feet (including bunions, if any).