Say what you want guys- when a so called pretentious, arrogant, pompous so called "climber" comes onto a site that is composed of other climbers with their own experiences (and might I say FAR superior skillsets), and has the audacity to proclaim that cotton is the way to go, then continues on spewing forth his "formal" education credits, it's time for a CALL OUT.
Pretentious, arrogant... It is what I think... you didn't bring any argument to your point of view.
A sponge??? a sponge absorb the water and keep the water inside the cotton layer. When you climb a route like Lincoln throat pretty fast, your T-shirt is going to be wet, but not the other hydrophobe layer (that means that the wool, which can loss 50% of his isolating capacity by conduction, or any other synthetic isolation, stay dry). You change the T-shirt and you still have a dry layer outside the cotton which is dry. Without sponge, the water migrate from a high concentration inside the first layer to a low concentration on the last layer, it is a flow of water and heat that you lost As a beginer belay, he is waiting in the cold...wet because the water is not evaporated immediately, but slowly. Whit the cotton, you are dry because the other layer are hydrofuge and the water is absorb by the cotton.
Diver suit are made of polypropylene. The water is trap inside the coat and the cold water can touch the body. It is an application of the sponge technique.
cotton cause many accident due to hypothermia. Particularly those people who hike with jeans or climb without t-shirt. But if you can take out your transpiration without deterioration of the isolation of the exterior layer..., you use the cotton's water retention as a sponge....an the other layer stay dry. So, as a sponge, cotton is good, as an exterior layer or isolation cotton is very weak. You can use a cotton t-shirt and an hydrophobe t-shirt under thermal imaging cameras and see the heat loss of each.
Further more, I told people to try the cotton before in safe place. For example, bring six people without knowledge of this conversation to Havard cabin, asked them to wait for three hours in the cold without large movement like in a belay. Do the