One of the original pieces in our lineup, the Helios Vest is a powerhouse classic that's chock full of core-warming 900+ fill power down. With Lycra arm holes and hem to seal in the heat, an insulated draft tube behind the zipper, and an incredible warmth-to-weight ratio, this is a great vest for keeping your core warm in colder weather. Great for: Backpacking, alpine ascents, ski touring, backpacking, general cold weather Details Quilted construction Insulated Draft Tube YKK #5 2-way Vislon zipper with windproof micro-fleece backer Lycra sealed hand-warmer pockets Zippered internal stash pocket Lycra hem and arm holes Made in the USA of imported materials Additional Info Garment Fit Relaxed Midweight Garment Type Midweight / Puffer Jacket Shell 20d x 20d Pertex® Quantum Pro® brushed nylon (41 g/m2), made from 60% bio-based materials. The durable water repellent (DWR) finish on our Helios jackets and vests is made without intentionally added perfluorinated chemicals (PFCs/PFAS). Lining Material 20d nylon taffeta made from recycled nylon. Fill Power 900+ Goose Down certified to the Responsible Down Standard (RDS) by TE-00118388 Fill Weight 4.8 oz / 136 g (size Medium) Average Weight 10.2 oz / 290 g (size Medium) Packed Size 3L Origin Made in Seattle, USA of imported materials