stone glacier|SKU:89-20002-GG-S

Stone Glacier Grumman Goose Down Pant — 16 oz, 850+ Fill Power Insulation

16 oz of Wilderness-Grade Warmth for the Backcountry

Sixteen ounces total — Carries nothing you don't need on a multi-day pack-in
850+ fill power down — HyperDRY™ treated for warmth retention even when damp
Full-length YKK zippers — Pull on over boots without removing them in the field
Packs to 9×4×4" — Disappears into a corner of your frame pack
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In the box

  • Stone Glacier Grumman Goose Down Pants
  • Stuff Sack
Grumman Goose Down Pant
Stone Glacier Grumman Goose Down Pant — 16 oz, 850+ Fill Power Insulation

16 oz of Wilderness-Grade Warmth for the Backcountry

The Stone Glacier Grumman Goose Down Pants deliver a warmth-to-weight ratio that makes them a non-negotiable for late-season glassing sessions. At just 16 oz, these pants use 850+ fill power RDS-certified goose down wrapped in a 15-denier Pertex Quantum shell to block wind without adding bulk. Full-length YKK zippers let you pull them on over boots at 10,000 feet without stepping out of your crampons. Packing down to 9” x 4” x 4”, this is trail-ready insulation that disappears in your pack. It is field-tested gear built for hunters who refuse to compromise on warmth or mobility.

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850+ Fill Power Down
HyperDRY Water Repellent
Full-Length Side Zippers
Weighs Just 16 oz
16 oz
Total Weight
850+
Fill Power Goose Down
9" x 4" x 4"
Packed Size
Warmth That Actually Makes It Into Your Pack

Warmth That Actually Makes It Into Your Pack

The enemy on a late-season backcountry hunt isn't cold — it's the insulated pant too heavy to justify carrying. You leave it at the truck, then freeze on a two-hour glassing session at 9,000 feet. The Grumman solves that with 16 ounces of 850+ fill power down that packs smaller than a Nalgene. We only stock gear that earns its spot on real hunts, and this pant passes that test — HyperDRY™ treated, RDS-certified down inside a Pertex Quantum shell that stays warm even when condensation or light precip hits. If we wouldn't pack it for a 10-day elk hunt, it doesn't make the catalog.

Pertex Quantum Shell Blocks Wind Without Adding Bulk

Pertex Quantum Shell Blocks Wind Without Adding Bulk

The 15-denier Pertex Quantum shell uses a tightly woven structure that lets the 850+ down fully loft while cutting wind completely. At 16 ounces total, there's no excess material — just a quiet, field-tested barrier between you and cold air moving across a ridgeline. Pertex Y Fuse yarns interlock to hold down in place over extended wash and wear cycles, so the insulation stays distributed where you need it instead of shifting into flat cold spots after a season of hard use. A slim waistline sits comfortably under your pack belt without bunching.

Full-Length Zippers Let You Gear Up Without Sitting Down

Full-Length Zippers Let You Gear Up Without Sitting Down

Full-length YKK zippers run ankle to waist on both legs, so you can pull the Grumman on over your hiking pants and boots without finding a dry rock to sit on. On a cold November glassing session, that matters — you want insulation on fast, not a five-minute wrestling match with tight ankle openings. When the sun hits and temps climb, unzip and stow the pants in the included 9×4×4-inch stuff sack. Patterned shell textiles reinforce high-wear areas so the fabric holds up season-after-season against abrasion from rocks, pack frames, and brush.

Sizing & Layering Guide

Designed with a slim waistline to layer comfortably under a heavy pack waist belt without bunching.

  • Total packed width measures exactly 4 inches
  • Total packed depth measures exactly 4 inches
  • Full-length zippers open completely from ankle to waist

Built For the Field

Season-proven insulation for when the mercury drops and you are miles from the truck.

High-Altitude Glassing Sessions
Cold Windy Ridge Approaches
Backcountry Basecamp Warmth

Full specifications

At a glance

Dimensions
9” x 4” x 4”
Power
850+ Fill Power Goose Down
Compliance
100% Traceable RDS Certified Down
Full specifications9 data points across 4 categories

Dimensions

Weight16 oz
Size in Stuff Sack9” x 4” x 4”

Power & Performance

Insulation4.2 oz. of Insulation
Fill Power850+ Fill Power Goose Down

Materials

Shell15 Denier Pertex® Quantum Shell
Insulation TreatmentHyperDRY™ DWR Treated Down
HardwareFull-length YKK Zippers

Compliance & Warranty

Down Certification100% Traceable RDS Certified Down
MPN20002

The Hunt Premium Promise

Every item we carry is vetted for real-world performance. If it doesn't hold up on a 10-day backcountry hunt, we don't stock it.

Authorized DealerFull manufacturer warranty honored on every product. No gray market, no surprises.
Free ShippingShips free with full insurance. Signature required to ensure your gear arrives safely.
30-Day ReturnsIf it doesn't fit your system, send it back within 30 days in original packaging.
★★★★★
“I packed these for a late November elk hunt in Montana — 10 days, 9,000 feet, and two glassing sessions over three hours each. At 16 ounces I almost didn't bring them, which would have been a mistake. Pulled them on over my base layers at first light, full-length zippers made it easy with boots on, and my legs stayed warm the entire session. They compress into nothing in the stuff sack. These are now a permanent piece in my pack.”
F
First L.Bozeman, MT

The Stone Glacier Grumman Goose Down Pants are incredibly light weight coming in at a whopping 16 oz. Designed to reduce weight and maximize packability for backcountry hunts. The Grumman pant is the next level down pant that you won’t leave back home cause of weight or not being warm enough. This pant has an incredible 850+ fill power, HyperDRY™ down insulation and a Pertex® Quantum shell that creates an unbelievable warmth to weight ratio. Other things that make these pants stand out from the rest is the packability size. The pants in the stuff sack come in at a total size of 9” x 4” x 4”. These pants have the YKK full zip zippers which will completely zip off from ankles to waist to get in and out of in the field with simplicity. The Grumman pants are for a long glassing session on top of the mountain or those cold windy days getting to that special spot on the map. You will never leave home without them.

FEATURES

  • 15 Denier Pertex® Quantum Shell
  • 850+ Fill Power Goose Down
  • HyperDRY™ DWR Treated Down
  • 100% Traceable RDS Certified Down
  • 4.2 oz. of Insulation
  • Full-length YKK Zippers
  • Fully Opened Leg for Easy On/Off
  • Patterned shell textiles for added durability in high wear areas.
  • Slim waistline for comfortable layering under pack waist belt.
  • Stuff Sack Included
  • Size in Stuff Sack: 9” x 4” x 4”
  • MPN: 20002

        SPECIFICATIONS

        Weight: 16 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

                        Granite Grey, Muskeg
                        Size

                        Extra Large, Large, Medium, Small, XXL

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                        Frequently Asked Questions

                        Synthetic insulation loses loft faster over time and weighs more for the same warmth. The Grumman uses 850+ fill power down with a HyperDRY™ treatment that retains warmth even when exposed to moisture — something synthetics handle but at a significant weight penalty. At 16 ounces with a 9×4×4-inch packed size, this pant occupies less space in your pack than most synthetic alternatives while delivering measurably more warmth per ounce. Over a decade of backcountry hunts, the down will outperform and outlast repeated compression cycles that flatten synthetic fills.
                        Yes. Hunt Premium is an authorized dealer for every brand we carry. When you purchase the Grumman Goose Down Pant from us, you receive the full manufacturer warranty with a verified serial number — no gray-market risk, no voided coverage if something goes wrong. Stone Glacier stands behind their products with direct warranty support, and buying through an authorized dealer is the only way to guarantee that backing actually applies to your purchase.
                        Your legs have less muscle mass and circulation than your core, which means they lose heat faster in stationary conditions. On a two-hour glassing session in November, your down jacket keeps your torso warm while your legs go numb — and cold legs cut a session short. The Grumman at 16 ounces adds meaningful lower-body insulation without the bulk or weight that makes you question bringing it. If you've ever cut a glassing session short because your legs were cold, this is the piece that fixes that.
                        HyperDRY™ uses a fluorocarbon-free treatment that bonds to the down cluster itself rather than coating the shell fabric. Pertex Y Fuse yarns create an interlocking structure that keeps down contained through wash cycles, so the treatment stays on the insulation where it works. Stone Glacier rates the down as RDS-certified and traceable, which means consistent quality control from source to finished product. Real-world feedback from backcountry hunters over multiple seasons confirms the water resistance holds up without the degradation common in older DWR-treated downs.
                        The Grumman is designed for stationary cold exposure — glassing sessions, ambush sits, and camp wear — not for active movement in deep cold. If you're breaking trail or climbing hard, a lightweight softshell is the right call. Pull the Grumman on when you stop moving and your core temp drops. The full-length zippers make that transition fast without removing boots. Think of it as the layer that turns a cold sit into a comfortable one, not as your primary hiking pant.
                        Stone Glacier patterned the Grumman with a slim waistline specifically for layering under a pack belt. The 15-denier Pertex Quantum shell is thin enough that it doesn't create bulk or pressure points when cinched down. The 4.2 ounces of insulation distributes evenly without bunching behind the belt padding. If you've worn bulky insulated pants that dig into your hips under a loaded frame pack, the Grumman's low-profile fit addresses that directly.
                        SKU: 89-20002-GG-S Categories: , Brand:

                        The Hunt Premium Promise

                        Every item we carry is vetted for real-world performance. If it doesn't hold up on a 10-day backcountry hunt, we don't stock it.

                        Authorized Dealer Full manufacturer warranty honored on every product. No gray market, no surprises.
                        Free Shipping Ships free with full insurance. Signature required to ensure your gear arrives safely.
                        30-Day Returns If it doesn't fit your system, send it back within 30 days in original packaging.

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                        About stone glacier Hunting Gear

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