An all-season favorite, the Merino 150 Long Sleeve can be sported as a base layer in the fall and as a single layer when summer backpacking calls. Using Core Spun technology, we've wrapped Merino around a nylon core for added durability, without losing the benefits of ultra-soft Merino. Our raglan sleeves eliminate shoulder seams for perfect comfort under a pack, and smooth merrow stitching wraps from side to front to keep you looking as good as you feel.