definitely fits a full size small. I ordered the proper size first (1/2 smaller than normal shoe) and the next size up (10, 10.5) and they were both way too small. Not even close to something I could break in. I then ordered the next two sizes up (11, 11.5) and the 11 was still too small.
Once I had the right size, the shoe fits amazing. Great shaping to it. Nice tight to box with just enough ark
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