>>904435Generally you need to avoid cotton since it sucks and hangs on to moisture. This is bad in 90% of /out/ situations.
There are a few situations where that can be a good thing:
Thin, lightly colored cotton layer is good in hot/arid conditions since it holds on to your sweat and cools you down.
Cotton has also been used for many years as outer-layer in very cold conditions (temperatures never above freezing). Apart from being soft, comfortable and wind-proof if tightly woven this is also because the cotton helps to suck out the moisture from yor inner layers of clothing so it can evapurate - really helping you stay dry from your own sweat.¨
Today many people stille swear to poly-cotton as shell layer in cold weather conditions instead of things like Gore-tex
