Merrill again knocks it out of the park! This is my 3rd pair of Merrill's, 2 pairs of wasterproof hiking shoes and know these waterproof snow boots. I wear a size 11 and have a somewhat narrow foot and narrower heel and pronate, my ankles are rather weak. Merrills  fit me well and have never required any break in time, Great quality in every pair. These are very cozy and warm, and for me to say that is something, my feet are always cold. They are light, and snow,water, slush, and ice tested and pass. I live Colorado and know what winter can be,