The most delicate equipment we take on any expedition is a collection of human bodies.
The human body has an optimum operating temperature of 37°c +/- 0.5°c.
Above or below this very narrow range it starts to malfunction. Push it more than a few degrees and it stops working quite quickly and is not covered by the manufacturers warranty.
Taking your body into environments outside this operating range therefore requires special considerations, the first of which is clothing.
Outdoor clothing manufactures spent decades trying to develop the latest miracle fabric that traps air, moves moisture but does not harbour the common bacteria that create unpleasant smells.
Nature on the other hand has been doing it for millions of years... Wool.
Although it is more absorbent than most synthetics, it transports most of that moisture away from the body.