4u

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4u

Design by S.I. Design

 

Experience the sleek, flowing lines of 4u—a perfect blend of sophistication, ergonomics & functionality. Designed to elevate any space, 4u offers a choice of mesh, upholstered or welded fabric “groove” backs—a slim, comfortable hybrid of mesh & fabric. Select from white or black frames with matching arms & bases. Also available as task stools.

See also the 4-UP series for telescoping gas lift sit-to-stand options.

4u mesh back with copper mesh and lumbar
Private office
Private office
Open office

Open office

Private office
Private office

Features

4u white frame with light grey groove
  • 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 Mechanisms: Quick-adjust synchro with single-rotation back & body balance options
  • Arms: Height & width adjustable options including choice of a dynamic roll back feature
  • Stool: Optional stool at tall or extra-tall heights with a repositionable black foot ring
  • 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-4u-seat

The enhanced comfort foam seat uses proprietary injection-molded foam with targeted high-density zones—delivering lasting support where it’s needed most. This strategic design relieves pressure points for all-day comfort.

 

close-up-4u-frame-back

The sleek, sculpted back showcases elegant Italian design—refined lines that balance sophistication with ergonomic intent.

 

close-up-4u-53A-arm

The dynamic adjustable arm, available in black or polished, offers height, width, depth & rotation adjustments—delivering personalized support in style. Its refined design adapts seamlessly to the user's movements for enhanced comfort.

 

The Collection

Find dimensions & symbols @ Spec It

  • 772-1
    Upholstered back chair
    Medium & large seats
  • 782-1
    Mesh back chair
    Medium & large seats
  • 787-1
    Groove back chair
    Medium & large seats
  • 772S
    Upholstered back stool
    (772S)
  • 782S
    Upholstered back stool
    (782S)
  • 787S
    Groove back stool
    (787S)

Options

Armless #0A

Armless (0A)

Black 6-way adjustable arm #33A

Black 6-way adjustable arm (33A)

White 6-way adjustable arm #35A

White 6-way adjustable arm (35A)

Black fixed loop #RA1B

Black roll back arm (39A6)

Black basic height adjustable arm #38A6

Black basic height adjustable arm (38A6)

Black dynamic adjustable arm #51A20

Black dynamic adjustable arm (51A20)

Polished dynamic adjustable arm #53A20

Polished dynamic adjustable arm (53A20)

 
  • Auto-Adjust body balance (74C)
  • Auto-Adjust body balance & seat depth (74C-12SS)
  • Quick adjust advanced synchro (67C)
  • Quick adjust synchro & seat depth (67C-SS)
  • Quick adjust synchro, seat depth & forward tilt (67C-SS-FT)
  • Auto-Adjust body balance (35C)
Stool with a black foot ring

Stool with a black foot ring:

Tall (11DRB)
Extra-tall (11XDRB)

 
 
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)

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)

Brochure (pdf)
Product Sheet (pdf)

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

 

Sustainability

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)
User Guide: All Adjustments (pdf)

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.

Featured Installs