Ultralight and packable with cold-weather protection, this jacket is made in collaboration with innovative Swiss cycling brand ASSOS for gravel bikepacking. Responsibly sourced, hydrophobic, 850-cuin-fill-power DRY DOWN is placed in small chambers for peak performance, insulating even when wet. Thanks to the featherlight Pertex® Quantum outer fabric, the down can fully expand for optimal warmth. The PFC-free DWR finish offers rain resistance. A 2-way front zipper allows for a versatile fit and harness compatibility. As an extra-warm outer layer or a small-packed thermal backup in a bike bag, the ASSOS x Mammut Aenergy IN Hooded Jacket provides lightweight insulation without compromise.