I only use comfortable shoes that fits perfectly, I don't like too small shoes where your toes are aching. I am size UK 6 and I ordered UK 6 and the shoes fit perfectly. I have a little bit wide feet and these boots are very comfy, they are not too tight! They are very warm but not slip proof. In fact, if there is ice on the road you cannot walk safely with these. I cannot use these boots in a climat like this one (northern Europe), because there is ice on the road almost the whole winter. These are good as long as there is no ice (= in the beginning and ending the winter season). I would advise precaution when purchasing these. There are lots of boots that are grip proof, but these are not! If you are searching a grip proof boots, these are not your choice.