Here are the measurements of our last for every model. You should consider some free space in the front part of the boot.
Usually, we recommend adding 7-10mm, so for a foot of 27cm we would recommend the size 42. However, if you wear some thicker socks in the winter, you might want to go for the 43.
Some people prefer a tighter fit, and some people like it a bit looser.
To find your size in our boots, as a general rule, for Red Wing owners, we recommend adding one size. For example, Red Wing 42 = Urban Shepherd 43.
HOW TO MEASURE YOUR FOOT:
1. Put your foot on a paper.
2. Circle the foot around.
3. Measure the distance from the longest toe to the heel.