Every pair of STP Tricker's I've bought have been UK sized. My STP Not Stows were 9.5UK but I probably should have gone with 10UK. I think the Not Stows are on the 2298 last which is narrower than the 4497 or 4444 country lasts. For 4497/4444 I go with 9.5UK. The Retrickers on ebay always have the lasts listed and are UK sized.