Experience the sleek, flowing lines of 4u by S.I. Design »—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.
Click the + signs or words below to see details on each option including frame colors & mesh.
Mesh
Groove
Upholstered
All 4u seats use Via Seating’s comfort foam. This is a proprietary blend of high-density, injection-molded, closed-cell, cold-cured comfort foam » so durable and lasting it is backed by Via Seating’s 12 year warranty. Unlike traditional stacked foam pieces, Via’s seats are contoured to maximize comfort and support where needed with a circulation supportive waterfall edge.
Enhanced comfort medium (B)
Enhanced comfort large (C)
Optional black adjustable lumbar support #LS4B
Optional white adjustable lumbar support #LS4W
Single upholstery
Two-tone upholstery #U2:
Available on upholstered backs only
Standard option is armless #0A.
Black signature 6-way arms #33A
White signature 6-way arms #35A
Black dynamic adjustable arm #51A
White dynamic adjustable arm #51A
Quick adjust synchro #67C
Quick adjust synchro + seat depth adjustment #67C-SS
Black 5-star base #18BB
White 5-star base #18WB
Polished 5-star #18PB
Black carpet casters #16HP
Grey-black all floor casters #16SCG
Black glides #16GL
Add a safety brake feature on all caster options that locks the caster when the user gets out of the chair #SL1.
Additional options may be available. See the pricing & specification tools here »
All Via Seating products follow the Design for the Environment (DfE) design approach ». During this process, all components are screened to identify and assess the human and ecosystem health impacts of chemicals of concern. We screen all product components to the ANSI/BIFMA e3-2019 Annex B- List of Chemicals of Concern and the California Proposition 65 List.
Our products are annually assessed by a 3rd party team of chemists & globally-recognized ISO 17025 accredited lab. They are rigorously tested for conformance to ANSI/BIFMA e3 standard credits 7.6.1, 7.6.2 and/or credit 7.6.3 as well as conference to low-emitting materials. Prior to product launch, every product is continuously developed testing its functionality & durability within Via Seating’s ISO 17025:2017 accredited lab ».
All Via Seating products are BIFMA LEVEL® certified. LEVEL® is an evaluation and certification system for environmentally-preferable and socially-responsible office furniture. 3rd party certification is achieved by conformance to a multi-attribute standard created by the Business and Institutional Furniture Manufacturer’s Association (BIFMA) that evaluates product impacts across categories including Materials, Energy, Human Health and Social Responsibility.
Via Seating provides accessible care guidelines » that help maintain the quality of every product and easy-to-follow disassembly instructions » when a product reaches the end of its life.
In 1996 Lorenzo founded S.I. Design with designers Mirco Pegoraro and Mauro Naletto. S.I. specializes in furniture design, particularly for offices and communal spaces. Today, their team of eight focuses on design and technical assistance in product development utilizing advanced modeling programs.
