Bought them a couple of days before a big hike, no breaking in necessary they fit perfect and where super comfortable. Great for crossing rivers and in the rain, kept my feet dry. Have been wearing them all winter and they have kept my feet warm and toasty. I have been using them as my main winter boot, one pair of wool socks, neon over boots in -30c temps all day and not a problem keeping my feet warm and dry and this the first winter my feet haven't been cold. Lovin' the winter outdoors.