Designed By Niels Diffrient

Summa Executive Chair with Wood Back Shell

A refined approach to everyday seating. Summa delivers balanced support and lasting comfort in a versatile, streamlined design.

Design Features

  • Weight-compensating recline

    Weight-compensating recline

    Automatically adapts to the sitter for effortless movement.
  • Red Dot Award-winning design

    Red Dot Award-winning design

    Recognised for its refined, contemporary executive profile.
  • Premium materials

    Premium materials

    Chrome-free semi-aniline leather and high-quality textiles create a refined, durable finish.
  • Minimal adjustments

    Minimal adjustments

    Simple height control keeps the chair easy to use and visually clean.
  • Executive-level comfort

    Executive-level comfort

    Sculpted cushioning and an inviting shape built for long days.

Specifications

Variant

SKU

U1WABAR13XFSSNC

Casters

Multi-Surface Caster for Hard or Soft Floor

Warranty

10 Years; Fabric/Cushions/Arm Pads/Casters/Wood: 5 Years

Dimensions

Width

711 mm

Depth

648 mm

Overall Height

921 mm - 1048 mm

Backrest Height

20.75 in.

Seat Depth

457 mm - 457 mm

Seat Height

394 mm - 521 mm

Weight

Overall Weight

20.87 kg

Weight Capacity

1368 kg

Materials & Sustainability

  • Product Materials

    Summa is constructed using die-cast aluminum, steel, engineered polymers, wood veneer, contoured seat cushion, and upholstery textile. Die-cast aluminum and steel form the structural frame and recline mechanism. Engineered polymers are used for components requiring flexibility and impact resistance. The wood veneer back and seat shell are responsibly sourced, selected for warmth and durability.

Who It's For

For people who want an executive chair that feels luxurious, looks architectural, and still supports real work.

  • Ideal for corner offices, private executive suites, and leadership workspaces
  • Perfect for boardrooms and client-facing environments where aesthetics matter
  • A strong fit for interior designers sourcing premium seating for high-end projects

Certifications & Testing
  • DECLARE® - Red List Approved
  • CDPH
  • BIFMA LEVEL® - Level 3
  • SCS Indoor Advantage Gold
  • MID

Care, Maintenance & Longevity

  • Upholstery

    Care instructions vary depending on the selected upholstery. Vacuum regularly using a soft brush attachment to remove dust and prevent dirt from working into the fibers. For spills, act quickly — blot liquids with an absorbent cloth before they set. Stains should be removed by gently dabbing with a lint-free cloth or sponge dampened with clean, warm water. If necessary, add a small amount of mild dish soap, then finish by dabbing with clean water. Avoid rubbing, as this may damage the textile surface. For wool textiles, professional dry cleaning is recommended for anything beyond surface stains. For detailed care instructions by upholstery type, refer to the Humanscale Care Guide.

  • Wood

    Wipe with a soft, slightly damp cloth and dry immediately — do not allow moisture to sit on the surface. For marks, use a furniture-grade cleaner suited to wood. Avoid abrasive pads and prolonged direct sunlight, which can affect the finish over time.

  • Frame, Base & Components

    Clean metal and plastic components with a soft, damp cloth and mild soap if needed. Dry thoroughly.

Summa's versatility takes it from the corner office to the boardroom to the executive home office.

An effortless blend of luxury and simplicity.

4.3
Rated 4.3 out of 5 stars
Based on 3 reviews
Total 5 star reviews: 2 Total 4 star reviews: 0 Total 3 star reviews: 1 Total 2 star reviews: 0 Total 1 star reviews: 0
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3 reviews
  • Claire B.
    Verified Buyer
    Rated 3 out of 5 stars
    Stunning craftsmanship

    Stunning craftsmanship. The wood back really stands out and makes a bold impression. I docked one star only because I wish it had a few more stain options, there's not really a nice neutral in between color option.

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  • Paige C.
    Verified Buyer
    Rated 5 out of 5 stars
    Adds a beautiful warmth to my home office

    Adds a beautiful warmth to my home office. The seat is soft and supportive, and the recline feels effortless. Definitely a showpiece that works as hard as it looks.

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  • Zara M.
    Verified Buyer
    Rated 5 out of 5 stars
    Wood back gives this chair such a refined

    The wood back gives this chair such a refined, sculptural look. It feels solid and luxurious, yet the ergonomic design still makes it comfortable for long meetings.

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