Choosing the right ergonomic chair can significantly impact your comfort, posture, and productivity—especially if you spend long hours seated at a desk. The Welax S9 Pro and S9 Basic ergonomic chairs are designed to support healthy sitting habits, but they target slightly different needs and budgets.
In this comparison, we break down the key differences and similarities between the S9 Pro vs. S9 Basic office chair, helping you decide which model fits your work style best.
Overview: S9 Pro vs. S9 Basic
Both chairs share the same ergonomic foundation, including adaptive lumbar support and a multi-position backrest. The difference lies in adjustability, materials, and premium comfort features.
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S9 Pro: Designed for users who want maximum adjustability and premium materials
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S9 Basic: Built for everyday ergonomic support with a clean, breathable design
Adjustment System: One-Touch Control for Both
Both the S9 Pro ergonomic chair and the S9 Basic office chair feature a one-touch control system.
This allows users to easily:
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Adjust seat height
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Control reclining positions
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Switch postures quickly throughout the day
A one-touch system simplifies daily use and encourages frequent posture changes—an essential habit for long-term comfort.
Armrests: 6D vs. 3D Adjustability
S9 Pro
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6D adjustable armrests
S9 Basic
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3D adjustable armrests
Armrest flexibility plays a major role in shoulder and wrist comfort. The S9 Pro’s 6D armrests provide more precise positioning, allowing users to fine-tune arm support for typing, mouse use, or reclining.
The S9 Basic’s 3D armrests still cover essential adjustments and are suitable for general office work.
Best for:
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S9 Pro → users who want highly customized ergonomic support
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S9 Basic → users who want reliable, everyday comfort
Headrest: Equal Neck Support
Both chairs include a 3D adjustable headrest, allowing height and angle adjustments.
This helps:
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Support the neck and upper spine
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Reduce tension during long work sessions
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Improve comfort when reclining
If neck support is important to you, both models perform equally well in this area.
Backrest: 5-Position Recline
The S9 Pro and S9 Basic ergonomic chairs both feature a 5-position backrest, enabling smooth transitions between upright working posture and relaxed reclining.
This flexibility supports:
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Active sitting
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Short breaks without leaving your desk
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Reduced lower back fatigue
Lumbar Support: Dynamic Adaptive Design
One of the most important features of any ergonomic office chair is lumbar support—and both S9 models deliver.
Shared Feature
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Dynamic adaptive lumbar support
This system automatically responds to body movement, helping maintain the spine’s natural curve while you shift positions.
Why it matters:
Dynamic lumbar support encourages better posture and reduces slouching over time.
Footrest: Included vs. Optional
S9 Pro
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Footrest included
S9 Basic
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Footrest optional
A built-in footrest adds versatility, especially for users who like to recline or stretch during breaks. The S9 Pro office chair offers this feature as standard, while the S9 Basic keeps it optional for a more minimal setup.
Base: Aluminum Alloy vs. Nylon
S9 Pro
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Aluminum alloy base
S9 Basic
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High-strength nylon base
The aluminum alloy base gives the S9 Pro ergonomic chair a more premium look and feel, while the S9 Basic’s nylon base focuses on durability and lightweight practicality.
Both bases are designed for stability and daily office use.
Gas Lift: Class-4 Safety Standard
Both models use a Class-4 gas lift, the industry standard for high-quality office chairs.
This ensures:
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Smooth height adjustment
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Strong load-bearing performance
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Long-term reliability
Material: Comfort vs. Breathability
S9 Pro
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Suede-touch material
S9 Basic
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High-elastic breathable mesh
The S9 Pro prioritizes a softer, more premium tactile experience, while the S9 Basic focuses on airflow and breathability—ideal for warmer environments or long sitting sessions.
Wheels: Quiet and Floor-Friendly
Both chairs are equipped with silent PU casters, allowing smooth and quiet movement across different floor types without causing damage.
Color Options
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S9 Pro: Three color options
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S9 Basic: Two color options
This gives the S9 Pro slightly more flexibility for matching different office aesthetics.
Which Ergonomic Chair Should You Choose?
Choose the S9 Pro if you:
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Want maximum adjustability (6D armrests)
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Prefer premium materials and finishes
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Value built-in features like a footrest
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Spend long hours at your desk daily
Choose the S9 Basic if you:
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Want essential ergonomic support at a simpler level
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Prefer breathable mesh seating
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Need a reliable office chair for everyday use
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Want flexibility with optional upgrades
Welax Recommendation
Both chairs reflect Welax’s commitment to ergonomic design and long-term comfort.
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The S9 Pro Ergonomic Chair is ideal for users seeking a more refined, feature-rich office chair experience.
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The S9 Basic Ergonomic Chair offers core ergonomic benefits with a clean, breathable design suitable for most workspaces.
You can explore both models on the official Welax website to choose the ergonomic chair that best fits your posture needs and work habits.
