DUO™ 300 High Back - EX DEMO
DUO 300 High Back - ONISCUS - EX DEMO
High-Back Dual Density Posture Support
The DUO 300 High Back combines the proven DUO™ Dual Density Posture Support Seat with a taller backrest for users who want broader support through the lumbar and upper-back regions.
Its seat uses a softer rear cushioning zone with a firmer front section, working together with the backrest to support pelvic positioning and create a more stable foundation for sustained sitting.
DUO™ Dual Density Posture Support Seat.
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How the support works
Sitting on the softer rear cushion allows the pelvis to settle gently towards the back of the seat, where it is held and supported between the firmer front cushion and the lower lumbar backrest as arrowed.
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These three elements work together to help locate and support the pelvis:
-
Softer rear cushioning allows the pelvis to settle into the rear seating area.
-
Firmer front cushioning helps define the pelvic seating position.
-
The lower lumbar backrest provides support behind the pelvis and lower back.
This relationship is intended to support the natural inward curve of the lower back and the spine’s overall S-shaped profile, helping the user find a supported alternative to a slumped, rounded sitting posture.
Upholstery
- Pure New Commercial-Grade ECO Wool upholstery - durable, breathable and sustainable
- IN-STOCK Colours : BLACKBUTT(Black) : VIOLA ( Navy Blue) : Oniscus CHARCOAL GREY - commercial grade Australian eco wool upholstery fabric.
- Special Custom Order - your choice of fabric and colour - wide range on offer
Key Features
- high-back ergonomic task chair
- DUO™ Dual Density Posture Support Seat
- firmer front / softer rear split-cushion construction
- high supportive backrest
- forward / backward tilt
- 6-position lumbar support
- intuitive adjustments accessible while seated
- commercial-grade upholstery options
- AS/NZS 4438 compliant
- AFRDI Tested 160kg
- 160 kg user weight rating
- 10-year warranty
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Support
Elevation
Angles
Tilt
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What this means for you when the 4 elements are aligned
| Corrected screen alignment → reduced neck strain | - S E E™ |
| Better pelvic support → less lower back fatigue | - S E A T™ |
| Arm positioning → reduced shoulder load | - A R M S™ |
| Movement support → reduces static load | - S P A S™ |
R E P O S E™ Outcome
The DUO 300 High Back supports Natural R E P O S E™ by coordinating the seat, pelvis and taller backrest as one supporting system.
Support the pelvis first — then extend that support through the back.
- DUO™ Dual Density Posture Support Seat
- Seat Width 495mm
- Seat Depth 480mm
- Seat Height 460-580mm
- Seat Tilt Range 12°
- Backrest 450W x 500D mm
- Backrest Height 480-545mm
- 160KG Weight Rated
Warranty: 10 Years
This product is supplied with a 10-year warranty covering defects in materials and workmanship when used under normal commercial office conditions. The warranty applies to structural and mechanical components. Normal wear and tear on soft or consumable elements is excluded.
DUO™ 300 High Back - EX DEMO
- DUO™ Dual Density Posture Support Seat
- high supportive backrest
- firmer front / softer rear seat cushioning
- forward / backward seat tilt
- 6-position lumbar support
- intuitive seated adjustment
Who Is It For?
Suitable for users who:
- spend extended periods working at a desk
- prefer a high-back ergonomic chair
- want broader spinal and upper-back support
- benefit from greater pelvic and lumbar support
- require adjustable seat and back positioning
- work in government, corporate, professional or home-office environments
- want the DUO support concept with more backrest coverage than the DUO 200
Problem to Solve
Good seated support begins at the seat–pelvis interface.
If the pelvis rolls backwards into a soft, unsupportive seat, the lumbar spine can follow into a more rounded sitting position.
The DUO 300 takes a pelvis-first approach.
Its Dual Density Split Cushion Seat combines softer cushioning beneath the rear pelvic region with a firmer front section. Together with the high backrest and lumbar support, this creates a coordinated relationship between the seat, pelvis and spine.
The taller backrest then provides additional support through the upper torso without relying on excessive seat softness.
S E A T™ — Primary
Support · Elevation · Angles · Tilt
The DUO 300 supports S E A T™ through:
- Dual Density split-cushion construction
- softer rear pelvic cushioning
- firmer front seat support
- high-back spinal support
- adjustable seat height
- forward / backward seat tilt
- adjustable backrest angle
- 6-position lumbar / back-height adjustment
- controlled posture variation throughout the day
The objective is not to maintain one rigid sitting position.
It is to provide a stable supporting geometry with enough adjustment and movement for posture to vary naturally.
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DUO 300 High Back - ONISCUS - EX DEMO
High-Back Dual Density Posture Support
The DUO 300 High Back combines the proven DUO™ Dual Density Posture Support Seat with a taller backrest for users who want broader support through the lumbar and upper-back regions.
Its seat uses a softer rear cushioning zone with a firmer front section, working together with the backrest to support pelvic positioning and create a more stable foundation for sustained sitting.
DUO™ Dual Density Posture Support Seat.
.png)
How the support works
Sitting on the softer rear cushion allows the pelvis to settle gently towards the back of the seat, where it is held and supported between the firmer front cushion and the lower lumbar backrest as arrowed.
.png)
These three elements work together to help locate and support the pelvis:
-
Softer rear cushioning allows the pelvis to settle into the rear seating area.
-
Firmer front cushioning helps define the pelvic seating position.
-
The lower lumbar backrest provides support behind the pelvis and lower back.
This relationship is intended to support the natural inward curve of the lower back and the spine’s overall S-shaped profile, helping the user find a supported alternative to a slumped, rounded sitting posture.
Upholstery
- Pure New Commercial-Grade ECO Wool upholstery - durable, breathable and sustainable
- IN-STOCK Colours : BLACKBUTT(Black) : VIOLA ( Navy Blue) : Oniscus CHARCOAL GREY - commercial grade Australian eco wool upholstery fabric.
- Special Custom Order - your choice of fabric and colour - wide range on offer
Key Features
- high-back ergonomic task chair
- DUO™ Dual Density Posture Support Seat
- firmer front / softer rear split-cushion construction
- high supportive backrest
- forward / backward tilt
- 6-position lumbar support
- intuitive adjustments accessible while seated
- commercial-grade upholstery options
- AS/NZS 4438 compliant
- AFRDI Tested 160kg
- 160 kg user weight rating
- 10-year warranty
.png)

Support
Elevation
Angles
Tilt
.png)
What this means for you when the 4 elements are aligned
| Corrected screen alignment → reduced neck strain | - S E E™ |
| Better pelvic support → less lower back fatigue | - S E A T™ |
| Arm positioning → reduced shoulder load | - A R M S™ |
| Movement support → reduces static load | - S P A S™ |
R E P O S E™ Outcome
The DUO 300 High Back supports Natural R E P O S E™ by coordinating the seat, pelvis and taller backrest as one supporting system.
Support the pelvis first — then extend that support through the back.
- DUO™ Dual Density Posture Support Seat
- Seat Width 495mm
- Seat Depth 480mm
- Seat Height 460-580mm
- Seat Tilt Range 12°
- Backrest 450W x 500D mm
- Backrest Height 480-545mm
- 160KG Weight Rated
Warranty: 10 Years
This product is supplied with a 10-year warranty covering defects in materials and workmanship when used under normal commercial office conditions. The warranty applies to structural and mechanical components. Normal wear and tear on soft or consumable elements is excluded.

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