4up

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4-UP

Extension of 4u by S.I. Design

 

Meet 4-UP—the ultimate sit-to-stand experience with a dynamic, telescoping gaslift. Unlike traditional solutions that limit users to sitting or perching, 4-UP unlocks the full potential of a sit-to-stand desk, allowing seamless movement between sitting, standing & every position in between. Featuring seat depth adjustment, ergonomic forward tilt & Via Seating’s proprietary injection-molded comfort foam, 4-UP delivers unmatched comfort & support. It’s no surprise it became the first-ever Best of NeoCon Business Impact award winner for an ergonomic desk chair.

4-UP mesh back with black framework, mesh & telescoping gas lift
Sit-to-stand chairs in a shared office
Sit-to-stand chairs in a shared office
Multizone office with sit-to-stand desks

Multizone office with sit-to-stand desks

Features

4-UP on telescoping gas lift
  • Award-Winning: Recipient of the first-ever Best of NeoCon Business Impact Award for Desk/Task
  • Mesh: 4-way stretch elastomeric mesh including copper-infused, self-sanitizing options
  • Upholstered Backs: sleek upholstered option with integrated, adjustable lumbar support
  • Groove: Welded fabric in multiple colors delivering a hybrid mesh-upholstered comfort
  • Comfort Foam: Durable, high-density comfort foam
  • Control Mechanism: Advanced synchro with quick-adjust seat depth & forward tilt
  • Arms: Height adjustable with dynamic roll back feature
  • Telescoping Gas Lift: Revolutionary sit-to-stand lift enabling sit, perch & in-between positions
  • Casters: Carpet & all-floor casters or all-floor glides
  • Specification Tools: Spec It, CET, CI Library, Project Spec, Hedberg, Cyncly, MRL & KITS
  • Contract: GSA #GS-28F-005CA
  • Weight Capacity: 300 lb
  • Manufacturing Time: 20 mesh/20 groove/15 upholstered back chairs produced in 48 hours with stocked textiles
  • Warranty: 12 years (5 years for mesh & groove)
close-up-4-UP-roll-back-arm-and-synchro

The dynamic roll back arm provides effortless access and height adjustability, supporting a wide range of postures throughout the day. Paired with an advanced synchro mechanism featuring seat depth and forward tilt adjustments, it delivers personalized ergonomic support for focused, long-term comfort.

 

close-up-4-UP-telescoping-gas-lift

Unlike traditional sit-to-stand chairs that only lock at fixed heights, the telescoping gas lift allows users to stop and lock at any position in between. This seamless adjustability supports every level of a sit-to-stand desk—enabling sit, perch & lean postures for all-day ergonomic flexibility.

 

close-up-4-UP-adjustable-footring

The repositionable footring easily adjusts to support proper leg placement across a range of seated and perched positions. Its intuitive design enhances comfort and stability, especially when working at elevated surfaces or sit-to-stand desks.

 

The Collection

Find dimensions & symbols @ Spec It

  • 782
    Sit-to-stand
    mesh back
    (782T)
  • 787
    Sit-to-stand
    groove back
    (787T)
  • 772
    Sit-to-stand
    upholstered back
    (772T)

Options

Armless #0A

Armless (0A)

Black fixed loop #RA1B

Black roll back arm (39A6)

 
  • Synchro, limited seat depth & forward tilt (67CLSFT)
No lumbar

No adjustable lumbar

Black adjustable lumbar #LS4B

Black adjustable lumbar (LS4B)

White adjustable lumbar #LS4W

White adjustable lumbar (LS4W)

Black 5-star base #18BB

Black 5-star base (18BB)

White 5-star base #18WB

White 5-star base (18WB)

Polished 5-star base #18PB

Polished 5-star base (18PB)

Telescoping gas lift with a black foot ring #11TDRB

Telescoping gas lift with a black foot ring (11TDRB)

 
 
Black carpet casters #16HP

Black carpet casters (16HP)

Grey-black all floor casters #16SCG

Grey-black all floor casters (16SCG)

Black glides #16GL

Black glides (16GL)

Looking for another option or more detail? Jump into the Option Look Up

Finishes

Matte black #B

Matte black (B)

Matte white #W

Matte white (W)

 
Black mesh #01U

Black mesh (01U)

Graphite mesh #03U

Graphite mesh (03U)

Stardust mesh #02U

Stardust mesh (02U)

Natural copper striped #13U

Natural copper striped (13U)

Black copper #11U

Black copper (11U)

 
Black groove #01UG

Black groove (01UG)

Dark grey groove #02UG

Dark grey groove (02UG)

Light grey groove #03UG

Light grey groove (03UG)

Alternate poly & frame finishes may be available. Please contact us to discuss customs.

Additional options in the Price Book

Make your own images @ Spec It

Downloads

General

Price List (pdf)

Mini-Brochure (pdf)
Product Sheet (pdf)

Ideate book (flipbook)
Breadth & Depth guide (flipbook)
Higher Education book (flipbook)
Healthcare book (flipbook)
Sustainability report (flipbook)

Certifications

BIFMA certification report (pdf)
BIFMA certification (pdf)
CLEAN AIR certification report (pdf)
CLEAN AIR certification (pdf)

Symbols

AutoCAD 2D (zip - dwg)
AutoCAD 3D (zip - dwg)
 Contact us for revit needs

Materials

4u Groove Material Spec Sheet (pdf)
4u Mesh Material Spec Sheet (pdf)
Copper Mesh Material Spec Sheet (pdf)
Standard Frames Material Spec Sheet (pdf)

Product Care

Cleaning & Care Guidelines (pdf)
Contact us for user guide needs

Standard foot ring assembly (pdf)
95% assembled final assembly (pdf)

Designer

si-design

S.I. Design

Lorenzo Negrello, born in Pádova in 1953, is an accomplished architect and designer whose early career included teaching design and earning two “Compasso d’Oro” nominations alongside Paolo Scagnellato. In 1996, he co-founded S.I. Design, a studio specializing in office and communal furniture design. Today, S.I. Design combines Negrello’s decades of expertise with advanced modeling tools to deliver innovative, technically refined products.