The Men's Stone Glacier Grumman Lite Down Jacket delivers ultralight and packable insulation engineered for climate control in the field. Wrapped in a 15-denier weather-resistant Pertex® Quantum shell, this jacket features 3.1 ounces of premium 850+ fill HyperDry™ goose down insulation that actively resists moisture to retain critical core warmth. Whether worn as an outer layer during static activity in cool conditions or layered underneath a technical shell when things get cold and wet, the Stone Glacier Grumman Lite Down Jacket delivers peak performance without taking up valuable space in your pack.