As far as baselayers go, the Patagonia
Merino 3 Midweight Pants are the cream of the crop. The blend of fabrics in these pants - which include merino wool, Capilene® polyester and a little spandex thrown in there - means 3 things: these pants will be soft against the skin, wicking and fast drying, and just stretchy enough for all sorts of activities. They've been slow washed for extra softness and shrink resistance and a flat, mesh-lined waistband allows for extra comfort.
78% Chlorine-free merino wool / 19% Capilene® polyester (100% recycled) / 3% Spandex
Gusseted crotch for unrestricted movement
Flat elastic waistband with brushed mesh inside for next-to-skin softness
Slow-washed without chlorine to prevent shrinkage
Machine wash cold, tumble dry at low temperature
bluesign® Approved Fabric - bluesign® approved fabrics offer the highest level of consumer safety by employing methods and materials in their manufacturing process that conserve resources and minimize impacts on people and the environment.