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Stay warm and dry in the harshest conditions with 509’s Active Layering System featuring Cold Armor technology. Pairing 509’s base and mid layers with 509’s outerwear creates a high-performance layering system that works together to keep you comfortable no matter what. The system starts with 509's lightest base layer, the 509 FZN Base LVL 1 Shirt—a close fitting next-to-skin layer designed to actively wick away heat-robbing moisture so you stay dry and comfortable all day long.
• LVL  - Our lightest next to skin base layer
• Lightweight, moisture-wicking polyester technical material
• Comfortable brushed interior fabric
• Sized to be fitted. Size up for loose fit