“UK versus US”

“This is a great product and a great buy. the problem was the confusion between the UK size and the US size. I ordered a size 8 for my wife and when it came it was a UK 8 which, of course,was way too small. On the exhange which was over the telephone the lady agreed to send out two pairs in size 10--and that is what was received but a UK 10 is a US 6. Your site does describe both systems but nevertheless I missed the difference. Ray Vinton Dallas, Texas”