Normally I wear UK size 5/EU size 38 (corresponding to US size 7 on the size chart of Clarks UK website). The size information from Amazon is slightly different, size 7.5=EU size 38. I thought I probably should trust Clarks, and knowing that this style always goes narrow and customer should go half size up, I finally chose US 7.5 on Amazon and It perfectly fit!

I love the look, color, and texture. And it is so comfortable to stand/walk in them for very long time without any heel pain.

Note: if you have really wide feet, you probably should think twice about this boot. It is a narrow design.