Practically essential to any and every Sitka System, the Core base layer series is designed purely for moisture wicking and comfort, utilizing 4-way stretch fabric. By literally pulling moisture off the surface of your skin, the Core garments are critical for keeping you dry from the inside out. The Core Series is made of 100% polyester bi-component technology that actively moves moisture away from the skin. To ensure a scent free hunt, the Core fabric utilizes silver encapsulated technology that kills odor-causing bacteria.