I'm getting back into the sport after a 15 year absence - and it has changed with the advent and acceptance of leave no trace. I understand the need to move away from cotton clothing to stay safe/warm, especially with out large fires to dry out if need be.

So... how much cotton in a set of pants or a shirt is too much?

Most fabrics are blends, so at what point (% cotton) does the downside of cotton outweigh the benefits of synthetics (low weight/fast drying/insulates when wet)?

As a point of departure, most military stuff (BDUs, working uniforms) is 50/50 cotton/poly; REI claimed that 20% cotton was the cut off, but I'm not sure if they are trying to sell me something...

Sincerely

Steadman