Use the size chart and don?t guess. At this price point ($115?), Id expect shoes to be better constructed. They are certainly built to do so! Highly recommend this item and so worth the money. will never buy again. I own three pairs of Sennheisers, which I love, but they all start to feel uncomfortable after a while. Also the coat doesnt appear to repel water any better. There may be metal in it - I cant recall. It worked great and was easy to install. Birkenstock does not make wide shoes or inserts and this inserts have foot-beds with sides which was uncomfortable for me.