Proper foot care paid off.
I used to think some calluses on my feet were good, making them tougher. I mostly get thick skin all around my heel and a bit on the ball of my feet; all is fine until I hike around 10 miles or 8 if on very uneven terrain. Type of shoe or boot made little difference here and basically what would happen is that the thick skin got a life of its own and would rub against the live layer of skin resulting in large blood blisters deep under the skin, right at the edge of my heels; with every step those deep blisters would push up the side of my foot and cause more skin to basically delaminate. Sorry for the gross image but it would end up in a bloody and painful mess.
So three weeks ago I started using a little sandpaper in preparation for a trip this last weekend; I was careful not to overdo it but I made sure my heels only had a thin callused area. I worked on it every day after a shower. It paid off. I hiked in wet boots, over uneven terrain for miles and had not a hint of a blister and not the slightest discomfort in my feet. I have not had a normal blister in many years and now I know how to avoid that other nasty version too.
Medium sand paper (60 or finer) worked better than pumice by far.





