If you know your (current) Dr size, they are spot on.  I am a 7 in Dr. Martens and basically a 10 in most US and a 41 in most Euro sizes.  I hope that helps!  They seem to be unisex, like most DOCs so if you have really narrow feet, you may not want them.  These soles are the ones I have on my original made in England Blue Suede DOCs which are really bouncy.  They were made in Thailand which seems to be better than the made in China DOCs I have.