Size range: 4 - 7.5 UK // 37 - 41.5 EU // 5 - 8.5 US. I had lost the original box, but the boots look as good as ever and I'm sure they'll make you a happy sailer. I have to admit - I just found them again at the back of the closet - I bought them before the pandemic but got the sizing wrong, because I'm an 8 UK and not an 8 US. so having realised they don't fit I chucked them in to the back of the closet and you know the rest of the story.
eBay