Description ***GOHUNT Staff recommends ordering true to size when worn over a base layer or lightweight mid-layer. Consider sizing up if you plan to wear it over a heavier fleece or insulated layer.*** The Outdoor Research Helium Down Hoodie combines lightweight 800-fill down insulation with strategic waterproof protection for cold, changeable mountain conditions. A recycled 20D ripstop nylon shell keeps weight low and packability high, while Toray Dermizax(TM) 2.75L overlays at the hood, shoulders, and upper sleeves add extra protection in areas most exposed to snow and moisture. An adjustable hood, multiple storage pockets, and a hand pocket that doubles as a stuff sack make it a versatile insulation layer for alpine objectives, backcountry travel, and winter use. Sizing Medium Large X-Large XX-Large Chest 38.5"-41.5" 41.5"-44.5" 44.5"-48" 48"-52" Waist 31.5"-34.5" 34.5"-37.5" 37.5"-41.5" 41.5"-45.5" Hips 37.5"-40.5" 40.5"-43.5" 43.5"-46" 46"-49.5" Sleeve Length 33.5" 34.5" 35.5" 36" How to Measure: Chest Measure around the fullest part of your chest, keeping the tape parallel to the floor and positioned under your arms. Arm With your hand on your hip, measure from the center of the back of your neck, across the shoulder to the elbow, and down to the outer wrist bone. Inseam Select a pair of pants that fits you well, then measure the inseam from the crotch seam to the bottom of the hem. Hips Measure around the fullest part of your hips, keeping the tape parallel to the floor. Waist Measure around your natural waistline at its smallest point. Specs Weight 15.4 oz Material - bluesignA(R) approved Toray 100% Recycled Nylon 20D Ripstop 40 G/M2 Main Shell- Toray Dermizax(TM) 2.75L 100% Nylon 15D Ripstop 61 G/M2 Waterproof Overlays- 100% Nylon 20D Ripstop 39 G/M2 Lining- 800 Fill Power- Responsibly Sourced Down Insulation Manufacturer Warranty Lifetime guarantee