- LVL  - 509's lightest next to skin base layer
- Lightweight, moisture-wicking polyester technical material
- Stylish full body sublimation print
- Comfortable brushed interior fabric
- Sized to be fitted. Size up for loose fit
- Materials: Cold Armor™ Polyester
- Warmth: LVL 
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 our lightest base layer, the 509 FZN 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.