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The last they build their boots off of tend to be more suited for people who have a wider heel. A different insole with more volume may move your foot high enough in the boot to tighten everything up and prevent this.
I haven't had a blister in 10 years probably, until these new Kenetreks. Both heels were torched after about 2 miles of steady incline. Maybe I will just tape up the heels and work at breaking them in on a flat surface along with some different inserts. I typically can hike all day, but those blister sure make you reconsider quickly.
In my opinion it has nothing to do with the brand of boot. It has everything to do with matching the shape and volume of the foot up with the right boot.Boots are that piece of gear that you can't take someone else's recommendation on. You must try them on your own feet to see If they will work.