TUO Kinetic Merino 250 Quarter-Zip Base Layer Shirt, Deadfall

You sweat on the walk in, then sit still while the cold settles in. That swing from hot to cold is where a good base layer earns its place, and the TUO Kinetic Merino 250 1/4 zip shirt is built for exactly that stretch of the day.

It uses a warm 250g interlock fabric made with 18.5-micron merino wool. Merino naturally wicks moisture away from your skin and resists odor, so you stay drier on the hike and less noticeable over a multi-day hunt. The fabric is made to hold thermal regulation and breathability together, helping you stay comfortable whether you are moving or glassing from a ridge.

The quarter-zip lets you dump heat on a steep climb, then zip it back up once you settle in. Flatlock seams lie flat against your skin to cut down on rubbing under a pack or outer layers.

Wear this merino base layer shirt on its own on a cool morning, or put it under your insulation and shell when the temperature really drops. The TUO Kinetic Merino 250 comes in the Deadfall grey colorway in men's sizes Medium through 2XL.