Sitka Women's Core Lightweight Crew Long Sleeve Shirt. The newly upgraded long sleeve and low-profile crewneck CORE Lightweight Crew Long Sleeve provides exceptional moisture management. This minimal top keeps you concealed when worn as an outerlayer in warm temps and provides critical comfort and moisture-wicking throughout the rest of the season. The stretch thumb loops keep sleeves in place when layering under jackets. The CORE Lightweight Series is the next-to-skin foundation for high-exertion hunts and a perfect layer to regulate body temperature.