Merino itchy, no fun there. What do you use for a synthetic "cool" underlayer under a windshirt? Went for an hour's hike in light rain this morning at 6C with just a hemp crewneck under my Montbell windshirt. Just some quarter sized damp patches on my shoulder bones, and a coolish neck. Could have used a long-sleeve zip-T made out of some really good wicking fabric such as runners use. Merino is way too itchy, sometimes I even find microfleece a bit itch inducing, but do layer it over my base occasionally. Thoughts?