Three miles into a familiar loop on a warm morning in May, I felt that specific hot spot on the back of my left heel that every walker recognises and every walker ignores. I ignored it. By mile five it was a blister the size of a thumbprint, and by the time I got back to the car I was walking on the outside edge of that foot like a man with a stone in his shoe. I spent the next few days blaming the boots. The boots had been fine for two years. It was the socks, and it had been the socks for longer than I want to admit.
The blister that was not the boot’s fault
What I had done that morning, without thinking about it for even a second, was grab a pair of ordinary cotton sports socks out of the drawer because my usual pair was in the wash. That was the entire difference between a good walk and a limp. Same boots, same route, same feet, different socks.
I had spent real money and real thought on boots. I had never once spent thirty seconds thinking about the layer that actually touches my skin for the whole five hours. Looking back, that is a strange set of priorities, and I do not think I am unusual in having had it.
Cotton, and how long it took me to accept the obvious
People had told me not to walk in cotton socks. I had heard it, filed it under things enthusiasts say, and carried on. The reasoning turned out to be simple and not at all mystical. Cotton absorbs sweat and then holds onto it. Wet skin is softer than dry skin, softer skin abrades more easily, and a boot that fits perfectly against a dry foot is rubbing against a slightly swollen damp one. That is the whole mechanism. There is no marketing in it.
What convinced me in the end was not the argument, it was doing the same route twice in a fortnight with the two different sock types and paying attention. Wool blend, no hot spot. Cotton, hot spot at about the same distance both times. I stopped arguing after that.
Thickness is part of how the boot fits, not a comfort dial
This one took me an entire winter to work out and it is the most useful thing on this list. I had assumed thicker socks were the cold weather choice and thinner ones the summer choice, and that was all there was to it. What thickness actually does is change the volume of your foot inside the boot, which means it changes the fit.
My boots were fitted while I was wearing a medium weight sock. When I put a thin sock in them, my heel had room to move, and a heel that lifts even slightly on every step for five hours is the most reliable blister factory I know. When I put a very thick sock in them for a cold January walk, the boot was tight across the top of my foot, my toes got cold because circulation was restricted, and I came home convinced my boots were not warm enough.
Neither problem was the boot. Now I think of sock weight as part of the fit, and if I want to walk in a much thicker sock I lace differently to allow for it, or I accept that this is a different combination and test it on a short loop first rather than a long one.
Seams, double layers, and one experiment that failed
The toe seam matters more than I expected. A flat or nearly flat join across the toes is worth looking for, because a raised ridge sitting across the top of your toes is unnoticeable for an hour and quietly maddening for four.
I also tried the two layer approach for a while, a thin liner under a thicker sock, on the theory that the two layers rub against each other instead of against your skin. For some people this apparently works very well. For me it did not, mostly because the liner kept creasing under the arch and I would end up with a fold I could feel every step. I gave it a fair go over about a month and then gave up. That is not a verdict on the method, only on my particular feet, and I mention it because gear advice that works brilliantly for one person can be plainly wrong for the next one.
How socks die, which is not how I thought
I used to keep a sock until it had a hole in it. Now I retire them earlier, because the failure that actually causes problems happens well before the hole. The elastic goes slack, usually around the arch and the cuff, and a sock that no longer holds its shape starts to shift inside the boot. Once it can move, it bunches, and bunched fabric under a heel is the same problem as a lifting heel.
Hot washes and tumble drying accelerate that considerably. I wash mine cooler than I used to and dry them on a rack, which has stretched their useful life by a noticeable margin. It is not a dramatic saving. It is just less annoying than discovering a sock has gone soft halfway through a walk.
What lives in my bag now
A spare pair, always, sealed in a plastic bag so they stay dry even if everything else in the pack does not. That habit came directly out of the flooded gateway on one of my regular tracks, and it has turned several wet miserable second halves into perfectly good ones. Changing socks at a halfway point on a wet day feels close to luxurious for something so small.
Beyond that, I own maybe five pairs of proper walking socks and I rotate them, which is boring and works. I do not think there is anything clever left to say about it. It is the cheapest part of the kit, it has the largest single influence on whether your feet are happy, and I spent two years not looking at it because it did not feel like real gear. It is the most real gear there is.