The Outdoor Research Option long sleeve zip jersey is fully buzz-word compliant: laser die-cut, glue-bonded, hydrophobic action, thermodynamic fabric.
In plain english, it’s a windshirt. In plain hip-hop, it would be plush threads pushin’ real, yo? But never mind that. The shirt is light enough at 14.1oz and cut for a loose fit, plus it’s somewhat stretchy so you don’t have to get all contortionist as you slip into something comfortable.
If you haven’t tried it, the zip-t form factor is the way to go to balance wicking, insulation, sun protection and ventilation. The pocket on the OR is a nice addition for when this is your primary layer.