Make your 509 shell go the distance with the 509 FZN Base layer - designed to wick and block moisture, meaning better climate control. Experience the comfort and performance difference using 509’s Active Layering System featuring Cold Armor technology. Cold Armor is a blend of technical materials constructed to wick moisture and create a cold blocking barrier for those frigid days. Pairing 509’s base layers with 509’s outerwear creates a high performance layering system that works together to keep you dry and comfortable. Starting with our lightest base layer, the LVL  is a next to skin layer designed to be close fitting and actively work to wick away moisture creating a comfortable in even the harshest conditions.