Magma Down Mummy — -20F

After a long day of breaking trail above the tree line, when the high-altitude chill truly sets in, the Magma Down Mummy is where you'll find reliable warmth. Engineered for the most demanding winter expeditions and arctic conditions, this bag is a non-negotiable for serious cold. Its -20F rating is powered by a generous 1100 grams of 900-fill power, RDS-certified goose down, treated for hydrophobic performance to maintain loft even in damp conditions. The expedition mummy cut, paired with vertical and horizontal baffles, locks that precious insulation in place, eliminating cold spots. An oversized, insulated draft collar and full-length draft tube along the YKK #5 anti-snag zipper seal in your body heat, while the articulated footbox provides critical warmth and room to move your feet. Wrapped in a resilient 10D Pertex Quantum Pro ripstop nylon shell with DWR, the Magma is built to withstand the rigors of your coldest adventures.

Technical

Weight	1.65 kg
Temp Rating F	-20
Fill Type	down
Fill Power	900
Fill Weight g	1,100
Shell Denier	10
Baffle Style	box baffle
Packed Size L	18
Zipper Side	left