The ThermaFlow 5.0 vest keeps the core warm and protected without overheating, ideal for high-intensity outings in cold, dry conditions. Its custom-developed double-weave fabric combines a windproof and water-resistant outer shell with a vented fleece inner made from lightweight, thermally efficient GRAPHENE yarn. Designed without a laminate, it prioritizes airflow while protecting from wind and light moisture thanks to a PFAS-free dirt and water-resistant coating and a taped-seam construction. It works great on its own or as a mid-layer under a shell when the weather changes. With 4-way stretch for greater freedom of movement, three zippered pockets for essentials, and bluesign® approved fabrics for environmental responsibility, the ThermaFlow 5.0 vest provides targeted warmth where it's needed most.