Reviewed for sustainabilityComosum Meter · Mater 3.8 / 5Show the six category scores

Eternity Side Chair is made by Mater. We review every brand we carry against published evidence in six categories; Mater scores 3.8 out of 5 (23 of 30).

  • Material 5 out of 5FSC wood, waste-based Matek; Wallpaper* 2019
  • Transportation 4 out of 5Mostly made in Latvia, Slovenia, Denmark
  • Manufacturing 4 out of 5EU partners; Bo Bedre sustainability award
  • Labor 4 out of 5EU partners bound by supplier code
  • Energy 3 out of 5No energy data published
  • Durability 3 out of 533 spare parts sold; 2-year warranty
Brand-level score · Rubric v2.2 · Reviewed September 2026How we score

Eternity Side Chair

Sale price$499.00

Shipping: $36 flat · FREE on orders $1,500+

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Color: Coffee Waste Light

Color

In Stock Items ship within two weeks

Eternity Side Chair

Space Copenhagen shaped this stacking chair from post-consumer e-waste plastic and reclaimed fiber, about 4,330 grams of waste per chair.

The shell is Matek, Mater's patented composite, which recycles fiber waste, coffee shells or wood depending on the colorway, together with recycled plastic from post-consumer e-waste. A frame of 20 percent recycled steel in gunmetal keeps it light enough to stack and sturdy enough for restaurant service. Mater, the Copenhagen design house founded in 2006, makes it in Latvia from Matek pressed in a hydropower-run facility. It is the chair most people start with in our Mater collection.

Materials

Matek shell (post-consumer e-waste plastic with coffee-shell or wood fiber waste); 20% recycled steel frame, gunmetal powder coat

Dimensions

Width: 21.1"; Depth: 21.7"; Height: 34.4"; Seat Height: 18.1"; Seat Depth: 16.9"

Seat Height

18.1 in

Back Height

34.4 in from the floor to the top of the backrest (16.3 in above the seat)

Designer

Space Copenhagen

Made in

Latvia

Colors

Coffee Waste Light; Coffee Waste Dark; Coffee Waste Black; Wood Waste Grey

Care

Wipe with a soft cloth wrung in lukewarm water; avoid abrasive cleaners and sharp objects

Common Questions

Is the Eternity Sidechair durable enough for commercial use?
Yes. Mater rates it for private and public use, and the molded Matek shell on a powder-coated steel frame is built for high-traffic dining rooms and cafes where chairs get moved all day.

Do Eternity chairs stack?
Yes. The sidechair is a stacking chair, so spare seating stores compactly between dinners or events. The armchair and the stools in the series do not stack.

What gives each finish its color?
The waste stream itself. Coffee-shell blends read warm brown through near-black, while wood waste reads gray. Variation in fleck and pigment between chairs is natural to a recycled composite.

Mater +

Mater is a Copenhagen-based design house pioneering sustainable innovation since 2006. Every piece tells a sustainability story—from FSC-certified wood and recycled ocean plastic to upcycled coffee waste and reclaimed mango wood. Collaborating with visionary designers, Mater fuses high-quality craftsmanship with environmental ethics, creating furniture that respects both people and planet.

Shipping & Returns +

In Stock Items Ship Within 7-10 Business Days * We will contact you to confirm any extended lead times for out of stock or backorder items

Country of Production +

Latvia

Dimensions +

Width: 21.1"; Depth: 21.7"; Height: 34.4"; Seat Height: 18.1"; Seat Depth: 16.9"

Care Guide +

To maintain the finish quality of your Mater product, please follow the care and cleaning procedures provided. Dust regularly with a soft, dry cloth. For wood surfaces, use a damp cloth with mild soap and dry immediately. For recycled composite surfaces, wipe with a damp cloth. Avoid harsh chemicals, abrasive cleaners, and prolonged sun exposure. Re-oil wood products periodically as needed.

Mater Sustainability Meter

Reviewed for sustainability by Comosum: Mater scores 3.8 out of 5 (23 of 30) across six categories, from published evidence.

  • MaterialFSC wood, waste-based Matek; Wallpaper* 20195 out of 5
  • TransportationMostly made in Latvia, Slovenia, Denmark4 out of 5
  • ManufacturingEU partners; Bo Bedre sustainability award4 out of 5
  • LaborEU partners bound by supplier code4 out of 5
  • EnergyNo energy data published3 out of 5
  • Durability33 spare parts sold; 2-year warranty3 out of 5
Total23 out of 30
3.8
Sustainability
grade out of 5
Brand-level score · Rubric v2.2 · Reviewed September 2026How we score

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Returns

30-day returns in unused, original condition. Start a return at hello@comosum.co — we'll coordinate it with you.

Warranty

Every piece carries its manufacturer's warranty — typically 2 years or longer. We handle all claims for you at hello@comosum.co.

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