I had ordered the boots because my old Viking now after a few years of use are no longer tight! The ancients had Grössse 44 and were plentiful so that even thick socks still fit! I had then decided to replace the model terrain but in 44 were too small and too narrow and are unfortunately out of 45! Since I discovered the model forest that from the sole ago looked like my old man and I ordered again Gr. 44 which was a mistake because these boots fall slightly smaller similar to the terrain! If you look closely to the size information is also apparent why! The boots are provided with EU 44 UK 9.5. Normally EU 44 but UK 10! And UK 10 fits me! So the boots go back and be again in 45 as set forth herein with UK 10.5 ordered!