Yeah Merino wool is interesting. It stays warm when wet and also breaks the wind a little bit and is flame retardant but also expensive. I tested it on a 61F pouring rain day when I wore a light merino wool shirt that I bought at MEC and cotton CK khaki. I felt warm on the top and cold on the bottom.

But what about organic cotton ? I see it more and more on outdoor stores shelves?

Frankie