Smartwool took their popular Merino 150 Base Layer and added a 1/4 zip to it.
This Smartwool® base layer is amazingly versatile and perfect for unpredictable weather—working as a single layer when it's warm out and the perfect start for more layers when the sun begins to hide behind the clouds. With Raglan sleeves and a flatlock seam construction designed to minimize chafing, you'll be able to rely on constant comfort all day long.
The lightest weight Merino jersey fabric uses a nylon core to increase durability while still keeping 100% Merino wool next to skin
Raglan sleeve design removes shoulder seams
8" (20 cm) center front zipper with semi-locking logo slider
Flatlock seam construction designed to minimize chafing