>>2638284None of the replies so far are wrong. Basically this happens due to a multitude of factors. The main issue is your heel is loose in your boot and is causing that friction. You could try tying your laces tighter, but that probably won’t work. I would get a better pair of boots, and always make sure that your heel stays down. When you are trying them on, make sure you wear the socks you Intend to use. Merino wool, like
>>2638362 suggested, would be great. I also like the normal Nike brand socks. With extreme miles, you might still develop blisters, before the get like pic, apply mole-skin or Luekotape. Also, if you are in a humid area, change your socks regularly.
