The 686 One Insulated Jacket keeps a clean, mountain-ready look built to hold up when conditions turn serious, not just on mild days. A 2-layer infiDRY® 10K shell with PFAS-free DWR and infiLOFT® 40g insulation through the body and sleeves handle sustained cold and wet weather, while an adjustable powder skirt, bungee cord hood, and hook-and-loop cuffs seal out snow and wind when a storm rolls in. Air-Flo™ underarm vents dump heat once the pace picks up, so the regular, layering-friendly fit stays comfortable from first chair to last run. What Our Gearhead® Experts Are Saying:"I got caught in a whiteout with sideways wind and the powder skirt and hood kept snow from finding any way in. The vents are the reason I never had to unzip the whole jacket just to cool off on the hike back up."