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With long sleeves and a no-roll mock turtleneck, the Sitka Core Midweight Mock delivers just enough warmth for chilly fall days without making you sweat. Permanent Polygiene® Odor Control Technology neutralizes odor by stopping the growth of odor-causing bacteria and fungi. The CORE Midweight Series is the foundation for your cool weather system, with a micro grid fleece backer that lightly insulates while actively moving moisture away from the skin.