I scored a Smartwool mid-weight long-sleeve zip-neck shirt at Steep and Cheap a couple days ago. It's in the mail now. (Don't tell anybody, but I already had a long-sleeve zip-neck Merino shirt, but it wasn't Smartwool.)

Knot, I think the breathability of nylon pants depends on how the fabric is made. All hiking pants these days are nylon, and hikers sweat alot and wear the same pants for 5 days straight without washing.