Shoulder season has arrived—it's not cold enough to break out your heavyweight fleece layers, but you still need that bit of extra warmth to keep your body temperature regulated. The Merino 150 Baselayer Bottom is Smartwool's lightest merino layer. The perfect weight for when you step away from the fire and the first few snowfalls. The legging is built with merino fibers wrapped around a nylon core which provides the durability of nylon, while giving you that soft merino touch. Merino wool naturally resists odors and wick moisture, keeping the fabric fresh. The wide waistband hugs you comfortably for long days on the move, and the slim fit layers nicely under your shell pants.