SMARTWOOL 250 Merino Wool Base Layer Crew Neck Sweater SmartWool's Merino 250 base layer top pulls moisture away from skin and offer lightweight warmth for cold-weather layering. Itch-free merino wool is temperature regulating, moisture wicking and odor resistant Crew neck Flatlock seams for chafe-free comfort Close, layer-friendly fit Base layer weight: Midweight Made in Vietnam New with tags