Materials

800 Fill Power Hydrophobic Goose Down

Premium goose down with a strong warmth-to-weight ratio and added moisture resistance.

Why we use it

800 FP down offers a great balance of warmth, durability, and value. It works well in products where a bit more durability matters more than shaving every last gram.

Used in

Basic line sleeping systems and selected insulated products.

Key specs

900 Fill Power Hydrophobic Goose Down

High-loft premium goose down built for maximum warmth at minimum weight.

Why we use it

900+ FP down expands quickly, packs small, and delivers excellent warmth for the weight. It is our preferred choice for ultralight sleep systems where low weight and compact packed size matter most.

Used in

Ultralight line sleeping systems and selected premium insulated products.

Key specs

Climashield® APEX 67 g/m²

Lightweight continuous-filament synthetic insulation for dependable warmth in damp conditions.

Why we use it

Climashield APEX keeps its loft well, dries faster than down, and continues to insulate even when exposed to moisture. It works especially well in lightweight overquilts, liners, and other products built for wet or variable conditions.

Used in

Snorkel Balaclava

Key specs

10D Nylon Micro Ripstop DWR

A lightweight and breathable downproof ripstop nylon used in down-insulated sleep systems.

Why we use it

This fabric offers a good balance of downproofness and breathability, allowing insulation to loft up quickly. In our view, 10D is the sweet spot between low weight, compact packed size, and durability for sleep systems. Its soft hand feel is another big advantage, especially for products used close to the body.

Used in

Main fabric in ultralight line sleeping systems, and lining fabric in down-insulated clothing such as FL 2 Winter Pants.

Key specs

15D Nylon Micro Ripstop DWR

A medium-weight downproof nylon with improved durability.

Why we use it

It is still fairly light, but noticeably tougher than 10D nylon and more forgiving in everyday use. The denser construction also offers a bit more resistance to moisture.

Used in

Main fabric in basic line sleeping systems with 800 FP goose down, and shell and lining fabric in insulated clothing such as Nord Jacket.

Key specs

15D Plain-Weave Nylon Taffeta

A durable medium-weight downproof nylon with a smooth hand feel.

Why we use it

This fabric combines a high thread count with a soft feel. Its smooth texture and the absence of DWR make it a great next-to-skin lining fabric for down sleep systems.

Used in

Lining fabric in the 350 Summer sleeping bag.

Key specs

20D Ripstop Nylon DWR

A durable medium-weight downproof nylon with ripstop reinforcement and DWR.

Why we use it

This classic downproof nylon works well as an outer shell fabric for a more durable everyday sleeping bag. It offers a good balance of weather resistance, durability, and practicality.

Used in

Shell fabric in the 350 Summer sleeping bag.

Key specs

20D Micro Ripstop Nylon DWR

A medium-weight downproof nylon with higher breathability and DWR.

Why we use it

This fabric was chosen specifically for the shell of down clothing. We prioritized higher air permeability so the insulation can release excess heat and moisture more easily during active use, without feeling clammy.

Used in

Shell fabric in FL 2 Winter Pants.

Note

Built to breathe better during active use.

Key specs

Levitex 10D Nylon with DWR

A lightweight and strong downproof ripstop nylon with DWR.

Why we use it

This is a more durable version of our 10D downproof fabric, used only in collaboration products with Levitate. It is less breathable than our 10D Nylon Micro Ripstop DWR, but offers a larger durability margin, which makes it better suited to a poncho quilt used outside the shelter.

Used in

Levitate × ROCK FRONT Multiquilt collaboration products.

Key specs

30D Ripstop Nylon DWR

A durable higher-density downproof nylon with ripstop reinforcement and DWR.

Why we use it

This is a tough and breathable downproof fabric for insulated clothing where long-term durability matters more than saving every gram. It is a strong choice for everyday wear.

Used in

Shell fabric in Nord Jacket and Vest.

Note

Prioritizes durability over minimum weight.

Key specs

7D Nylon Ripstop DWR

A lightweight and breathable ripstop nylon used in wind shells.

Why we use it

This fabric combines very low weight with high breathability, making it a strong choice for active use. It helps balance wind protection with better moisture and heat release.

Used in

Air Lite Windbreaker Jacket.

Note

Requires careful handling around sharp abrasion points.

Key specs

15D Sil/PU Ripstop Nylon

A lightweight non-breathable ripstop nylon used for reliable weather protection and low packed size.

Why we use it

It blocks rain and wind, packs small, and works well in simple ultralight shells where mechanical venting matters more than membrane breathability. Silicone coating on the outer side helps shed water and keeps the fabric from wetting out. PU coating on the inside allows seams to be taped for full waterproof protection in the finished product.

Used in

Rain Hoody and other rain protection gear.

Note

Best paired with mechanical ventilation.

Requires careful handling around sharp abrasion points

Key specs

20D Sil/Sil Micro Ripstop Nylon

A lightweight and durable nylon tarp fabric with silicone coating on both sides.

Why we use it

This fabric offers strong waterproof performance and good strength at low weight and packed size. It works well in ultralight shelters where low weight and tear strength matter.

Used in

Skyhiker Ultralight Tarp (nylon version).

Note

Best suited to flat tarps with catenary cuts.

Sil/sil fabrics cannot be seam taped, but seams can be sealed with a silicone-based sealant.

Key specs

20D Sil/Sil Micro Ripstop Polyester

A polyester tarp fabric with silicone coating on both sides.

Why we use it

This fabric combines strong waterproof performance and good durability, but its main advantage is dimensional stability in wet conditions. Unlike nylon, silicone-coated polyester does not absorb as much moisture or stretch as much, helping the tarp keep a better pitch in damp weather.

Used in

Skyhiker Ultralight Tarp (nylon version).

Note

Sil/sil fabrics cannot be seam taped, but seams can be sealed with a silicone-based sealant.

Polyester stays more stable in wet conditions than nylon.

Key specs

Cordura® 1000D

A dense, abrasion-resistant nylon fabric built for high-wear areas.

Why we use it

It works well in reinforcement zones and parts that need strong abrasion resistance. Its textured surface also provides better grip against other surfaces.

Used in

Outsole fabric in Camp 2 Bivvy Shoes.

Note

Best used where abrasion resistance matters more than low weight.

Key specs

40D PU Ripstop Polyester

A polyester tarp fabric with silicone coating on both sides.

Why we use it

This fabric offers a good balance of low weight and puncture resistance, making it a reliable protective outer layer. PU coating on the inside allows seams to be taped for full waterproof protection in the finished product.

Used in

Outsole fabric in Camp 2 Bivvy Shoes.

Note

Adds reliable weather protection in exposed areas.

Key specs

Polartec® Alpha™ 120 g/m²

An active insulation fabric built for warmth, breathability, and fast drying.

Why we use it

Polartec Alpha works well input use. layers designed for movement. It helps retain warmth while releasing excess heat and moisture more effectively than traditional fleece in high-out

Used in

Alpha Hoody 120.

Key specs

Polartec® Alpha™ 100 g/m²

A lighter version of Polartec Alpha for breathable insulation with less bulk.

Why we use it

This weight is a good choice for high-output layers where low bulk, quick drying, and steady comfort matter most.

Used in

Alpha Hoody 120.

Key specs

Polartec® Alpha Direct™ 120 g/m²

A highly breathable lofted insulation fabric designed to be worn without a liner in some applications.

Why we use it

Alpha Direct is exceptionally air-permeable, dries fast, and feels light for the warmth it provides. It works especially well in minimalist active layers built for cold-weather movement. Also, it’s less lofted but more durable than Polartec® Alpha™ 120 insulation.

Used in

Alpha Hoody 120.

Note

Best suited to high-output use in cool to cold conditions.

Key specs

Stretch Mesh Polyester

A soft and highly elastic polyester with a mesh-like structure.

Why we use it

Its stretch allows freedom of movement, while the mesh texture helps moisture and vapor pass through. At the same time, it creates a light barrier that adds a bit of extra warmth to the sleep system.

Used in

Comfort Sleeping Bag Liner.

Note

Adds light warmth without restricting movement.

Key specs

Microfiber 200 g/m²

A polyester microfiber fabric that absorbs moisture well and dries quickly.

Why we use it

Despite its compact packed size, this fabric can absorb several times its own weight in moisture and dries quickly after wringing out.

Used in

Hiker Towel.

Note

Absorbs moisture well and dries quickly after wringing.

Key specs

15D DTY Nylon

A lightweight, breathable nylon with a soft hand feel.

Why we use it

Thanks to DTY (draw texturized yarn) technology, this fabric feels surprisingly close to lightweight cotton while staying light, fast-drying, and easy to care for.

Used in

Ultraliner and Ultrasoft Mat Sheet.

Note

Requires careful handling around sharp abrasion points.

Key specs