stone glacier|SKU:89-20001-SG-S

Grumman Goose Down Jacket — 11.8 oz Backcountry Insulation

Ultralight Warmth That Packs Down to Nothing

11.8 oz packed weight — Compresses into 8" x 4" x 3.5" stuff sack
850+ fill power down — 5.3 oz of HyperDRY™ water-resistant goose insulation
Pertex Quantum shell — Wind-resistant, breathable, DWR-treated fabric
RDS certified traceable — Ethically sourced 90/10 goose down fill
Breaks up your outline — Strategic color blocking for mountain concealment
  • Free Shipping -- Fully insured — signature required over $500
  • Authorized Dealer Warranty -- Full Stone Glacier manufacturer warranty honored

This product is currently out of stock and unavailable.

🔒 100% Secure Checkout

Visa Mastercard American Express Apple Pay Google Pay Klarna Link by Stripe
Free Returns 30-day hassle-free returns.
Free Delivery Every order, every time.
Ships in 3–5 Days Heavy-duty crating included.
4.9/5 Stars 2,400+ verified reviews.

In the box

  • Grumman Goose Down Jacket
  • Stuff Sack
Grumman Goose Down Jacket
Grumman Goose Down Jacket — 11.8 oz Backcountry Insulation

Ultralight Warmth That Packs Down to Nothing

The Grumman Goose Down Jacket delivers serious backcountry warmth at just 11.8 oz — field-tested insulation that compresses into an 8" x 4" x 3.5" stuff sack. Filled with 5.3 oz of 850+ fill power HyperDRY™ goose down inside a 15-denier Pertex® Quantum shell, this is wilderness-grade gear built for solo hunts where every ounce matters. The DWR-treated, RDS-certified down stays warm through light rain and snow, while the articulated hood and streamlined cuffs seal out wind on exposed ridgelines.

FREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORTFREE SHIPPING30-DAY RETURNSEXPERT SUPPORT
RDS Certified Down
Water Resistant Shell
11.8 oz Total Weight
Stuff Sack Included
850+
Fill Power Rating
11.8 oz
Total Jacket Weight
5.3 oz
Goose Down Fill
Warmth That Earns Its Spot on Every Pack-In

Warmth That Earns Its Spot on Every Pack-In

The enemy on a late-season elk hunt isn't the cold — it's the jacket that weighs two pounds and still leaves you shivering at 11,000 feet. The Grumman flips that equation with 5.3 oz of 850+ fill power HyperDRY™ down trapped inside a 15-denier Pertex Quantum shell that actually holds heat. At 11.8 oz total, this is insulation that earns its spot in your pack the way every piece on Hunt Premium does — season-proven in real conditions, not studio photos. RDS-certified traceable down means you know exactly what's inside.

Shell Fabric Built for Mountain Reality

Shell Fabric Built for Mountain Reality

Pertex Quantum uses a tightly woven structure that lets the 850+ down fully loft while staying quiet in the timber. The Y Fuse variant adds Y-shaped filaments that interlock for improved downproofing and water beading — critical when you're sitting in light snow for four hours waiting on a timber bull. A DWR finish sheds precipitation without sacrificing breathability, and reverse coil YKK zippers seal out wind without catching on layers. This is field-tested construction that holds up wash after wash, season after season.

Packable Warmth That Disappears When You Don't Need It

Packable Warmth That Disappears When You Don't Need It

At 11.8 oz, the Grumman stuffs into an 8" x 4" x 3.5" sack that disappears in the bottom of a frame pack. The articulated hood and elastic waist hem seal in heat when the temperature drops at first light, while the streamline internal cuff keeps cold air from creeping up your sleeves on a long glassing session. Strategic color blocking breaks up your silhouette on open ridges. This is wilderness-grade insulation designed for hunters who count every ounce on a 10-day backcountry hunt.

Sizing & Fit Guide

The Grumman runs true to size with an athletic cut designed to layer over a base and mid-layer without excess bulk.

  • Fits over a base layer and light mid-layer without restriction
  • Articulated hood accommodates a hunting cap or beanie underneath
  • Elastic waist hem seals against drafts without riding up during movement

Built for the Hunt

Designed by backcountry hunters who understand that weight savings on the trail means more miles and more opportunity.

High-Altitude Backcountry Hunts
Light Rain and Snow Conditions
Solo Pack-In Missions
Extended Glassing Sessions

Full specifications

At a glance

Dimensions
8" x 4" x 3.5"
Power
850+
Compliance
100% Traceable RDS Certified Down
Full specifications16 data points across 4 categories

Dimensions

Size in Stuff Sack8" x 4" x 3.5"

Power & Performance

Fill Power850+
Down Fill Weight5.3 oz
Total Weight11.8 oz
Wind ResistanceWind Resistant
Water ResistanceWater Resistant
BreathabilityBreathable

Materials

Shell Fabric15 Denier Pertex® Quantum
Insulation90/10 Goose Down
Down TreatmentHyperDRY™ DWR Treated
Down Certification100% Traceable RDS Certified Down
ZippersYKK Zippers
Cuff DesignStreamline Internal Cuff
HemElastic Waist Hem
HoodArticulated Hood

Compliance & Warranty

MPN20001

The Hunt Premium Promise

Every product we carry earns its spot through honest evaluation. Here's what you can expect when you order from Hunt Premium.

Authorized Dealer GuaranteeFull manufacturer warranty honored on every product. No gray market, no surprises.
Free ShippingFully insured shipping with signature required on orders .
30-Day ReturnsUnworn, original packaging — if it doesn't work for your hunt, send it back on us.
★★★★★
“Wore this on a 7-day September elk hunt in Idaho. Stuffed in the bottom of my bag and forgot about it until the temperature dropped 30 degrees on day four. Pulled it out at first light and stayed warm through two hours of glassing. Weighs nothing, packs down to nothing, and actually works when you need it.”
F
First L.Bozeman, MT

The best warmth for weight of any hooded jacket, Stone Glacier’s Grumman Goose Down Jacket delivers ultralight weight, water-resistant, down warmth with just the right amount of HyperDRY™ 850+ Fill Power – a revolutionary water resistant down. Weighing only 11.8 oz with 5.3 oz. of 90/10 goose down fill so you can pack it to your solo hunt and not worry about carrying extra weight.

Pertex® Quantum fabric is designed to trap still air and improve the efficiency of insulation. This shell is Wind Resistant, Water Resistant and Breathable. A durable water repellent (DWR) finish will keep you hunting even with light rain and snow. A well fit hood, reverse coil YKK zippers, and a unique cuff design paired with strategic color blocking for breaking up body symmetry on the mountain have made this piece an office favorite at Stone Glacier.

FEATURES

  • 15 Denier Pertex® Quantum Shell
  • 850+ Fill Power Goose Down
  • HyperDRY™ DWR Treated Down
  • 100% Traceable RDS Certified Down
  • Articulated Hood
  • 5.3 oz of Insulation
  • Streamline Internal Cuff
  • Elastic Waist Hem
  • YKK Zippers
  • Stuff Sack Included
  • Size in Stuff Sack: 8” x 4” x 3.5”
  • MPN: 20001

      SPECIFICATIONS

      Weight: 11.8 oz

      Size Chart: Click Here

          PERTEX

          Pertex® Quantum uses a tightly woven structure to provide a light and soft fabric that allows insulation to fully loft while also being quiet, windproof, lightweight and packable.

              Y Fuse

              Pertex® Y Fuse fabrics use yarns with unique Y shaped filaments. These filaments create a tightly interlocking structure which improves downproof and water beading properties. The interlocking structure of Y Fuse fabrics remains highly stable over extended wash and wear cycles.

                  HyperDry

                  HyperDRY™ water resistant down is treated with a unique Fluorocarbon Free treatment that adheres to the down cluster that allows down to retain its superior warmth to weight ratio – even when wet.

                      Responsible Down standard (RDS)

                      All down products from Stone Glacier come from an RDS Certified Supplier. We only use down that comes from ducks & geese that were treated ethically.

                      Additional information

                      Color

                      Coyote, Granite Grey, Stone Grey, Tarmac
                      Size

                      Extra Large, Large, Medium, Small, XXL

                      Reviews

                      There are no reviews yet.

                      Be the first to review “Grumman Goose Down Jacket — 11.8 oz Backcountry Insulation”

                      Your email address will not be published. Required fields are marked *

                      Frequently Asked Questions

                      At 11.8 oz with 850+ fill power, the Grumman delivers warmth-to-weight that synthetic insulation cannot match at this weight class. HyperDRY™ treated down resists moisture absorption far better than untreated down, narrowing the gap with synthetics in damp conditions while retaining superior loft and packability. If your pack weight matters on multi-day hunts, the Grumman compresses to roughly the size of a Nalgene bottle — something no synthetic piece at equivalent warmth can do.
                      Hunt Premium is an authorized dealer for Stone Glacier. Your jacket ships with the full manufacturer warranty, and because we only sell through authorized channels, that warranty is fully honored — no gray-market risk. We also offer a 30-day return window: return the jacket unworn in original packaging with tags attached if it doesn't meet your expectations.
                      The Grumman is designed as an active insulation piece, not a belay-style parka. For November elk at 9,000 feet, pair it with a solid base layer and a windproof or softshell outer for static glassing sessions. Where it excels is as your core insulation while moving — hiking in, packing out, or glassing on the move. If you run cold during long sits, consider layering it under a heavier shell rather than expecting standalone warmth in single-digit temps.
                      Pack the Grumman when weight and packability drive your decisions — early season archery hunts, September backcountry trips where every ounce counts, or as a dynamic layer during high-output days. Go with a heavier puffy when you're sitting static in extreme cold for extended periods. Most backcountry hunters carry both: the Grumman for the hike in and active glassing, swapping to a heavier insulated piece once they're set up on a vantage point for the evening.
                      HyperDRY™ applies a DWR treatment directly to the down clusters, causing water to bead and roll off rather than absorb into the fill. In field use, this means the jacket maintains loft significantly longer than untreated down when exposed to condensation, light rain, or snow. It is not waterproof — no down insulation is. But combined with the DWR-treated Pertex Quantum shell, the Grumman handles the kind of moisture you encounter on a real hunt: sweat during the climb, frost at first light, intermittent snow.
                      The Grumman is designed to fit over a lightweight to midweight base layer in its standard sizing. If you plan to layer it under a hardshell or over a heavy fleece, sizing up one level gives you the room without restricting the down's ability to loft. Check the Stone Glacier size chart linked on this page — the fit is athletic but not restrictive. If you're between sizes, going up is the safer call for a hunting layering system.
                      SKU: 89-20001-SG-S Categories: , , Brand:

                      The Hunt Premium Promise

                      Every product we carry earns its spot through honest evaluation. Here's what you can expect when you order from Hunt Premium.

                      Authorized Dealer Guarantee Full manufacturer warranty honored on every product. No gray market, no surprises.
                      Free Shipping Fully insured shipping with signature required on orders .
                      30-Day Returns Unworn, original packaging — if it doesn't work for your hunt, send it back on us.

                      Related products

                      About stone glacier Hunting Clothing

                      stone glacier is a trusted manufacturer of premium hunting clothing. HuntPremium is an authorized dealer offering the full stone glacier lineup with free delivery, price match guarantee, and expert support.

                      View all stone glacier products →

                      Related Categories

                      Hunting Backpacks 1 products Hunting Blinds 12 products Hunting Knives 3 products
                      Join the Grill Island Community

                      Expert Picks, Straight to Your Inbox

                      No spam. Just the gear worth knowing about.

                      No spam. Unsubscribe anytime.