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and resists melting on outer layer of garment
4-way stretch hybrid swim short is built for maximum comfort & versatility
time after time after time
lined with warm brushed tricot
509 FZN LVL 1 Base Layer Longsleeve 2026SpringTent and resists melting on outerStay 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
