Women US6=UK3.5=EU36.5=23cm, Women US6.5=UK4=EU37.5=23.5cm, Men US9.5=UK8.5=EU43=27.5cm, Men US10=UK9=EU44=28cm, Men US10.5=UK9.5=EU44.5=28.5cm, Men US11=UK10=EU45=29cm, Men US12=UK11=EU46=30cm