I have spent most of the winter finding a perfect fit boot for me with no luck. I have purchased two other pairs of man-made materials that were ill-fitting (on the small size). I decided to splurge and take a chance on this pair. I couldn't be more delighted. I tend toward fitting 9.5 to 10 (or Euro size 41) and these fit my foot length bang-on. Other reviewers have said they feel tight in the foot. That is entirely possible, as I am wider then a regular foot, but smaller than a 10W so it's a perfect fit for me. It's also bit narrower in the back of the ankle, which is also great for me. The calf fits just right as well, my calf is 17" and fits just right. Do not purchase if your calves are wider than this, as there is not really any stretch and you would be very disappointed.