This is a common misconception. Somewhere along the way, this advice got passed down and stuck. The only reason to order a size larger than normal is if the shoe runs small or you plan on wearing incredibly thick socks with the boots.
Most of the boots on our list have their own insulation systems built in and you won’t need to wear an extra thick sock with the boots to ensure your warmth. I
f you have the ability, it is always a good idea to try on the boots with the pair of socks that you plan to wear with them. If you do this, you will be able to see exactly how the boots fit and will know if you need to adjust your size.