An all-season favorite, wear the Smartwool Women's Classic All-Season Merino Base Layer Long Sleeve Top in the fall or as a single layer when summer backpacking calls. With Core Spun technology, Merino wool is wrapped around a nylon core for added durability while keeping the temperature regulation and moisture management benefits of ultra-soft Merino next to skin. Raglan sleeves remove shoulder seams for comfort under a pack and smooth merrow stitching wraps from side to front for a flattering look.