See any reason for the blisters? My current boots which I've had for some time do the same thing if I don't put a plaster over each heel before hunting.
They are Vasque Wasatch, looked ok when I purchased them but Ive noted a pressure spot caused by a join in the outer leather,
Thinking of renewing them even though they are still in good condition. looking at Gri sport or the stoney creek range, had enough of very sore heels while hunting.
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