Sporty ergonomic office swivel chairIN brings running to sitting! The patented Trimension® kinematics, with two independently movable swing arms, two ball joints at hip height, and two push joints at the knee axis, ensures maximum three-dimensional seat dynamics. This technology mirrors the fluid movement of running without causing fatigue.Psychologists, physiotherapists, and orthopedists agree: life means movement. It's not just about the back, intervertebral discs, or joints, but the entire organism. Sufficient movement is a prerequisite for stress management, well-being, and lasting performance, making it a top topic in workplace health promotion. For decades, our passion has been to get people moving at their desks.Activating the entire body from the ankles to the cervical spine prevents musculoskeletal disorders, stimulates metabolism, and increases performance.The synergy of direct drive, flexible high-tech seat-back element, and 3D knitted backrest creates remarkable dynamics and unparalleled seating comfort. Even the smallest weight shifts lead to fluid posture changes, perceived as highly natural and comfortable.The interaction between human and chair is completely intuitive, making mobility a frequently used and versatile feature.The ingeniously simple implementation of Trimension® kinematics ensures a sporty look. In addition to flawless workmanship and high-quality surfaces and materials that meet the highest standards, we guarantee their durability and offer a minimum 5-year warranty.New Look: IN with new knitted fabricWith the new "ReForm" knitted fabric available in ten colors, IN receives a highly attractive and sustainable facelift. The two-tone yarns made from 100% recycled polyester highlight different colors depending on the knit pattern. The different color zones further emphasize the sporty character of the swivel chair.Available from March 2025Product InformationFrame: Five-star base made of black-dyed, glass fiber-reinforced polyamide, optionally die-cast aluminum, coated, polished, or high-gloss polished. Each chair has two independently movable swing arms made of die-cast aluminum, coated, polished, or high-gloss polished, with polypropylene covers. Counter chair with footrest from program 170 ON, with additional height-adjustable foot ring, chrome-plated, with clamping screw for fixation.Castors: Double swivel castors, load-dependent braked, made of black or white polypropylene according to DIN EN 12529 as standard for carpets, optionally with gray polyurethane tread for hard floors, optionally electrically conductive.Gas spring: Infinitely adjustable gas spring, covered by telescopic protective tube made of black or white polypropylene.Mechanism: Trimension®, integrated, synchronously supporting 3-D kinematics, allowing the right and left seat halves to tilt in all directions via independently movable swing arms to activate the natural movement diversity of the human pelvis. Mechanism housing made of die-cast aluminum, black or white matt coated with bellows made of black or white polypropylene and thermoplastic elastomer to enclose the centrally mounted spring. Rotary knob for counterpressure adjustment made of polyamide (for body weights from 45 kg to 140 kg).Seat/Back element: One-piece, highly elastic, and joint-suspended seat-back system made of high-performance polyamide plastic. Seat shell made of black or white polyamide with seat overlay made of polypropylene. Ergonomically shaped seat cushion made of polyurethane, CFC-free foamed, covered with Racer fabric, optionally with zoned knitted fabric. With optional soft cushion, more pronounced edges due to higher foam volume and all fabric covers with side cushion bases (knitted fabric not available with soft cushion). Optional seat depth extension adjustable in 4 steps from 40 to 45 cm. Seat overlay, cushion, and covers are replaceable.Armrests: Armrests made of glass fiber-reinforced, black or white polyamide. 1D armrests height-adjustable in 10 steps by 100 mm. 3D armrests: pads additionally adjustable by 50 mm in depth and rotatable by 25 degrees inwards and outwards. 4D armrests: additionally adjustable by 25 mm in width. Optionally available without armrests.Accessories: Optionally with coat hanger or height- and depth-adjustable headrest (headrest not possible if the chair is equipped with a coat hanger). Optional headrest made of dyed polyamide, matching the frame color black or white, height-adjustable by 60 mm in 6 positions, tiltable by 125 degrees, thus depth-adjustable by 50 mm.Technical DetailsFunction: Office swivel chair with Trimension®, an integrated, synchronously supporting 3-D kinematics, allowing the right and left seat halves to tilt in all directions via independently movable swing arms to activate the natural movement diversity of the human pelvis – from flexion and extension to lateral tilting and pelvic rotation. The coupling of the 3-D synchronous mechanism with a highly elastic seat-back system ensures automatic adaptation to every movement and sitting posture of the user, so that the body is supported in every posture and remains balanced.The supporting counterpressure in every direction of movement is infinitely adjustable for body weights from 45 – 140 kg by regulating the central spring force. The backrest optionally has a height-adjustable lumbar support (adjustable in six positions up to 60 mm).Backrest and seat can be locked in the neutral sitting position; optionally, the 3-D forward tilt by 5° can be activated at the push of a button to maximize the range of movement. Seat height is infinitely adjustable by gas spring between 400 mm and 520 mm according to DIN 4550. Seat depth: 43 cm, optionally with seat depth extension adjustable in 4 steps from 40 to 45 cm while seated. (Models with raised seat position (ESP) are adjustable between 440 mm and 580 mm, and counter chairs between 65 cm and 78 cm.)Frame: Five-star base made of black-dyed, glass fiber-reinforced polyamide, optionally die-cast aluminum, color-coated (e.g., white textured matt), polished, or high-gloss polished. Double swivel castors, load-dependent braked, made of black or white polypropylene according to DIN EN 12529 as standard for carpets, optionally with gray polyurethane tread for hard floors. Castors optionally electrically conductive. Gas spring covered by telescopic protective tube made of black or white polypropylene.Mechanism housing made of die-cast aluminum, black or white textured matt coated with bellows made of black or white polypropylene and thermoplastic elastomer to enclose the centrally mounted spring, rotary knob for counterpressure adjustment made of black or white polyamide (for body weights from 45 kg to 140 kg). Each chair has two independently movable swing arms made of die-cast aluminum, color-coated (e.g., white textured matt), polished, or high-gloss polished, with polypropylene covers.Seat-back system: One-piece, highly elastic, and joint-suspended seat-back system made of high-performance polyamide plastic. Seat shell made of black or white polyamide with seat overlay made of polypropylene. Ergonomically shaped seat cushion made of polyurethane, CFC-free foamed, covered with Racer fabric, optionally with zoned knitted fabric, material-matched to the backrest cover. Alternatively, with fabric covers from the Wilkhahn fabric collection, then with sewn-in cushion base and longitudinally contoured deep-draws as well as material- and color-matched side cushion bases.With optional soft cushion, more pronounced edges due to higher foam volume and all fabric covers with side cushion bases, material- and color-matched. Knitted fabric not available with soft cushion. Optional seat depth extension adjustable in 4 steps from 40 to 45 cm. Then standard and soft cushions with side cushion bases in Racer, color-matched for Racer fabric, for other fabrics in black, anthracite, or light gray. Seat overlay, cushion, and covers are replaceable.Back section designed as a back frame, optionally with lumbar support made of Hytrel®, matching the seat shell black or white, adjustable in six positions up to 60 mm and retrofittable at any time. Backrest cover with knitted fabric, integrating different elasticities for flexible and supporting zones, optionally double-layered cover with integrated foam, zoned. Colors according to Wilkhahn sample card.Optional headrest made of dyed polyamide, matching the frame color black or white, height-adjustable by 60 mm in 6 positions, tiltable by 125 degrees, thus depth-adjustable by 50 mm. Padded, fabric-covered with cover 37 Racer or Evida 58, color-matched to the backrest cover or in black. Headrest not available in combination with coat hanger. Retrofitting the headrest is possible on request.Armrests: Armrests made of glass fiber-reinforced, black or white polyamide. 1D armrests height-adjustable in 10 steps by 100 mm, 3D armrests: pads additionally adjustable by 50 mm in depth and rotatable by 25 degrees inwards and outwards, 4D armrests: additionally adjustable by 25 mm in width. Pads made of black or gray polypropylene, optionally polyurethane foam. Optionally available without armrests.Standards: IN swivel chairs comply with office chair standard DIN EN 1335 Type A, ANSI/BIFMA X5.1, and IGR.Technical Specifications / Features:Patented Trimension® 3D kinematics for dynamic sittingFive-star base, glass fiber-reinforced polyamide or die-cast aluminumDouble swivel castors for carpets or hard floors, optionally conductiveInfinitely adjustable gas springOne-piece, highly elastic seat-back systemErgonomic seat cushion, CFC-free polyurethaneOptional seat depth extension (40–45 cm)1D, 3D, or 4D adjustable armrests, or without armrestsOptional headrest or coat hangerComplies with DIN EN 1335 Type A, ANSI/BIFMA X5.1, IGRMinimum 5-year warranty