When You’re In Motion – Climbing, Hiking, Running Trails – Regulating Thermal Comfort Is Essential. Made To Balance Air Flow And Insulation, The Proton Vest Wraps The Core To Deliver Warmth Without Overheating. Softshell Durable, The Fortius™ Air 21 Outer Stretches, And Balances Moderate Wind And Weather Protection With Airflow. Octa® Loft Knit Insulation Provides Warmth That Resists Packing Out Over Time. The Chest Pocket Is Sized For A Radio, And The Trim Fit Layers Easily Under A Shell.
