Drying Kit In The Field Is Mostly About Body Heat

On a trip of several days, kit gets wet and has to be dried without electricity, a fire or a drying room. The available energy is limited and knowing where it comes from determines what is worth attempting.

Evaporation needs energy from somewhere

Turning water into vapour takes a large amount of heat, which is why wet clothing feels cold. Drying anything means supplying that heat and then carrying the vapour away.

Outdoors, the sources are sun, wind, and the body. Sun is unreliable, wind works only when humidity is low, and the body is the one source that is always present.

This reframes the problem. Rather than looking for a place to hang things, the question becomes which items are worth putting the body's limited output into.

Wring first, because mechanical removal is free

Squeezing water out costs no heat at all, and removes far more than an hour of evaporation would. It is consistently the highest-value step and consistently skipped.

Rolling a wet garment inside a dry towel or spare shirt and pressing transfers a surprising quantity of water by capillary action, and it works on down as well as synthetics.

Only after mechanical removal has been exhausted does evaporation become the limiting process. Starting a drying attempt with a soaked garment wastes the heat that would otherwise finish the job.

Synthetics dry on the body, cotton does not

A thin synthetic base layer worn under an insulating layer will dry as you walk, because the fibres hold little water internally and the vapour can move outward.

Cotton absorbs water into the fibre itself and holds it against the skin. Attempting to dry it by wearing it removes body heat for hours and produces very little result.

Wool sits between the two. It carries more water than synthetic and feels less cold doing it, but it will not dry on a walk in the way a thin synthetic will.

Insulation is the item that must not get wet

A sleeping bag or an insulated jacket cannot realistically be dried in the field. Its loft is the insulation, and once water has collapsed it there is no mechanism available to restore it.

The effort therefore goes into prevention: a liner bag, a dry bag inside the pack, and never letting a wet garment share a compartment with a dry one.

Where a dry morning appears, insulation goes out first and everything else waits, because it is the item with the longest recovery time and the greatest consequence.

Overnight is warmer than it looks

Damp socks placed against the torso inside a sleeping bag will be dry by morning, at a modest cost in comfort and a real cost in the bag's own dryness.

Whether that trade is worth making depends on how many nights remain. On the last night it always is; on the first of five it generally is not.