i am pretty sure that info is located on the lip or tongue on your shoe it should be where is always is underneath the tongue of your shoe can't find it then all is lost.
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US size 5 in womens is a size 3 in the UK
In a ladies shoe, a size 5 in US is a size 2.5 - 3 in UK. In a man's shoe, a size 5 in US is a size 4 - 4.5 in UK. Unisex shoes are either mens or ladies so you need to find out what they actually are and work from there.
