THIS BOOT IS BUILT ON TRICKERS 4497K BUMP TOE LAST - WIDTH FIT 5 OR US WIDTH D.
THESE ARE UK SIZING - EG UK 8 = US 9, BUT THIS LAST DOES HAVE MORE VOLUME THROUGHOUT THAN SOME OTHER TRICKERS LASTS.
TRICKER'S HAS SIZING INFORMATION AVAILABLE HERE. THE 4497K LAST FALLS INTO "MOST LASTS AND STYLES" IN THAT CHART.
PLEASE REACH OUT WITH ANY OTHER FIT QUESTIONS.