What Our Gearhead® Experts Are Saying:"This is the baselayer I grab for everything—trail runs, ski tours, long hikes. It’s incredibly breathable, super light, and the merino blend keeps me from smelling like I’ve been out all day."Whether we’re logging high-output miles or dialing in a lightweight layering system, the Long-Sleeved Capilene Cool Merino Blend Shirt keeps us comfortable across a wide range of conditions. Patagonia combines the natural temperature regulation and odor resistance of RWS-certified merino wool with recycled polyester for faster drying and better durability. The slim fit makes it easy to layer under midlayers or shells, and subtle details like a drop-tail hem, side vents, and soft stitching keep it functional and comfortable all day long.