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IN Swivel Office Chair – Ergonomic and SportyThe IN office chair by Wilkhahn offers dynamic seating comfort and ergonomic design for maximum freedom of movement and healthy working. The patented Trimension® kinematics ensures maximum three-dimensional seating dynamics thanks to two independently pivoting arms, two spherical joints at the hips, and two push joints at the knees. This technology reflects the fluid movement of running without causing fatigue.Activates the entire body, from ankles to cervical spine, preventing musculoskeletal disorders, stimulating metabolism, and increasing performance.The synergy of direct transmission, a flexible high-tech back element in torsion, and the 3D-Formstrick (form-fit knit) back cover creates remarkable dynamics and unparalleled seating comfort.Even the smallest weight shifts result in smooth posture changes that feel very natural and comfortable. The interaction between user and chair is completely intuitive, making mobility a frequently used and versatile feature.The ingeniously simple implementation of Trimension® kinematics gives a dynamic appearance. In addition to impeccable manufacturing quality and high-quality surface and material properties that meet the highest standards, indestructibility is guaranteed, with a standard warranty of at least 5 years.New Look: IN with New Form-Fit KnitWith the new "ReForm" form-fit knit, available in ten colors, IN receives a highly attractive and sustainable "facelift." Thanks to bicolor threads made of 100% recycled polyester, one or the other color comes to the fore depending on the knit pattern. The different color zones further accentuate the sporty character of the swivel chair. Available from March 2025.Product InformationFrames and Casters:Five-star base in black dyed polyamide, glass fiber reinforced, optionally in die-cast aluminum, coated, polished, or high-gloss polished.Two pivoting arms that can move independently, in die-cast aluminum, coated, matte polished, or high-gloss polished, with polypropylene protective caps.Counter chair with ON 170 star base, with additional height-adjustable foot ring, bright chrome, with locking screw for fixing.Double-wheel swivel casters with load-dependent braking, in black polypropylene according to DIN EN 12529 as standard for carpets, optionally with gray polyurethane tread for hard floors, optionally electrically conductive.Gas Lifts and Mechanisms:Precisely adjustable gas lift, covered with a telescopic protective tube in black or white dyed polypropylene.Trimension® 3D integrated synchronous support kinematics allowing the right and left halves of the chair to tilt in any direction via two flexible pivoting arms.Mechanism shell in die-cast aluminum, matte black or white coated, with bellows in black or white dyed polypropylene and thermoplastic elastomer for the flexibly mounted central spring.Counter-pressure adjustment knob in polyamide (for users weighing 45 to 140 kg).Seat and Backrest:Single-piece, highly elastic, flexibly suspended back element in high-performance polyamide.Seat shell in black or white dyed polyamide with seat panel in polypropylene.Ergonomic seat cushion in polyurethane with CFC-free foam, covered with Racer, optionally also with Formstrick (form-fit knit) offering different support zones.Optional soft padding with more defined edges due to increased foam, all fabric covers with padded side panels in the same material and color (form-fit knit not available with soft padding).Optional seat depth extension, adjustable in 4 lockable positions from 40 to 45 cm.Seat panel, padding, and covers are replaceable.Armrests:Armrests in glass fiber reinforced polyamide, black or white dyed.1D armrests: height adjustable in 10 lockable positions over 100 mm.3D armrests: armrest pads can also pivot 50 mm in depth and 25 degrees inward and outward.4D armrests: also width adjustable by 25 mm.Optionally without armrests.Accessories:Optional with coat hanger or headrest adjustable in height and depth (headrest not possible when chair is equipped with a coat hanger).Optional headrest in dyed polyamide, black or white to match the frame color, height adjustable by 60 mm in 6 lockable positions, with a 125-degree tilt function, allowing 50 mm depth adjustment.Technical Details:Function: Office chair with Trimension®, integrated 3D synchronous kinematics allowing the right and left halves of the seat to tilt in any direction via two flexible pivoting arms. The goal is to encourage the natural range of pelvic movement, including flexion, extension, lateral movement, and rotation. The combination of 3D synchronous adjustment mechanism with highly elastic seat and backrest ensures the chair automatically adapts to any movement or posture adopted by the user. The body is supported in any position and maintains its center of gravity.Counter-pressure, providing support in all directions, is precisely adjustable for users weighing 45 to 140 kg by modifying elasticity. The backrest optionally features height-adjustable lumbar support (six lockable positions up to 60 mm). The backrest and seat can be locked in the neutral sitting position, and the 3D forward tilt of 5° can be activated at the push of a button to maximize movement range.Seat height can be precisely adjusted at the push of a button between 400 mm and 520 mm via a gas lift according to DIN 4550. Seat depth: 430 mm, optionally with seat depth adjustable in 4 lockable positions from 400 to 450 mm. (Raised sitting position (ESP) models: height adjustable between 460 mm and 640 mm; counter chairs: 650 mm to 780 mm).Chassis: Five-star base in black dyed polyamide, glass fiber reinforced, optionally in die-cast aluminum, coated, polished, or high-gloss polished. Double-wheel swivel casters with load-dependent braking, in black polypropylene according to DIN EN 12529 as standard for carpets, optionally with gray polyurethane tread for hard floors. Optionally electrically conductive casters. Gas lift covered with a telescopic protective tube in black dyed polypropylene. Mechanism shell in die-cast aluminum, matte black coated with bellows in black dyed polypropylene and thermoplastic elastomer for the flexibly mounted central spring, counter-pressure adjustment knob in polyamide (for users weighing 45 to 140 kg).Each chair has two pivoting arms that can move independently, in die-cast aluminum, coated, matte polished, or high-gloss polished, with polypropylene protective caps. Counter stool with ON 170 star base, with additional height-adjustable foot ring, bright chrome, with locking screw for fixing and double-wheel swivel casters with load-dependent braking.24-hour chairs are always equipped with a die-cast aluminum star base, with additional pivot arm supports and high-performance covers. Designed for users up to 150 kg, models also comply with British standards.Backrest Element: Single-piece, highly elastic, flexibly suspended back element in high-performance polyamide. Seat shell in black or white dyed polyamide with seat panel in polypropylene. Ergonomic seat cushion in polyurethane with CFC-free foam, covered with Racer, optionally also with Formstrick (form-fit knit) offering different support zones, in the same material as the backrest cover.Or with fabric covers from the Wilkhahn fabric collection, then with sewn trims and deep longitudinal stitching for contours, as well as side trims in the same material and color. When optional soft padding is chosen, edges are more defined due to increased foam, and all fabric covers with padded side trims are in the same material and color. Form-fit knit is not available with soft padding. Optional seat depth extension, adjustable in 4 lockable positions from 40 to 45 cm. Standard and soft padding with side trims in Racer, color-matched when the fabric cover is Racer, in black (37/99) for all other fabrics.Seat panel, padding, and covers are replaceable. The backrest part is the frame, optionally equipped with Hytrel® lumbar support (can be retrofitted at any time), available in black or white to match the seat shell and adjustable in height by 60 mm in six lockable positions. The backrest is covered with Formstrick (form-fit knit) with different elasticities for flexible and support zones, optional two-layer Formstrick cover with integrated padding foam with different support zones.Colors from the Wilkhahn sample card. Optional headrest in dyed polyamide, black or white to match the frame color, height adjustable by 60 mm in 6 lockable positions, with a 125-degree tilt function, allowing 50 mm depth adjustment. Upholstered, covered with 37 Racer or 58 Evida fabric, color-matched to the backrest cover, or in black. Headrest not possible when the chair is equipped with a coat hanger. The headrest can be retrofitted on request.Armrests: Armrests in black dyed polyamide, glass fiber reinforced. 1D armrests: height adjustable in 10 lockable positions over 100 mm. 3D armrests: armrest pads can also pivot 50 mm in depth and 25 degrees inward and outward. 4D armrests: each can also be width-adjusted by 25 mm. Armrests in black dyed polypropylene, optionally in polyurethane foam. Optionally also without armrests.Standards: IN task chairs comply with DIN EN 1335 for type A office chairs, ANSI/BIFMA X5.1, and IGR standards.Models and Dimensions: Various models and configurations are available, including different base types, armrest options, and upholstery choices. Please refer to the product gallery for visual references.Certifications: The IN chair range is certified with GREENGUARD, GREENGUARD Gold, BLUETICK, GS, LGA, and GREENTICK, ensuring high standards for safety, sustainability, and environmental impact.Downloads: Product brochures, manuals, certificates, and environmental information are available in PDF format.Videos: Instructional and promotional videos are available for correct settings, usage, and product features.Technical Specifications:Seat height: 400–520 mm (standard), 460–640 mm (ESP), 650–780 mm (counter chair)Seat depth: 430 mm, adjustable 400–450 mm (option)Backrest height: adjustable with optional lumbar support (60 mm, 6 positions)Weight capacity: up to 140 kg (standard), up to 150 kg (24-hour models)Warranty: minimum 5 yearsCompliance: DIN EN 1335, ANSI/BIFMA X5.1, IGR