i have had the same malamutes for probably 5 years. i have size 10.5 and i used to use them probably close to 160-180 days a year when i worked at my ski hill. they packed out maybe half a size. in the first season and the second no change. in my 3rd i got new liners from salamon and have used the same since. i have done many alterations to them when i got my custom foot beds but other than that they are still great. the rubber on one dried out a bit over the summer but i rubbed vasoline in it for 3 weeks and it sofened out a bit but i think this is my last season with them. they have done me very well.