Dynamic Lumbar
Adaptive lower-back support
2.0" Seat Depth
Sliding seat adjustment
135° Recline
3-position recline lock
360° Armrests
Multi-angle arm support
Pull-Out Footrest
Built for relaxed breaks
Breathable Mesh
Cool, airy sitting comfort
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Ergonomic Office Chair
OTO Zenpex
For Work. For Focus. For Everyday Comfort.
Sale price$329.00Regular price
$399.00Save $70
- Dynamic dual lumbar support for all-day lower-back comfort
- 1.96" adjustable seat depth fits different sitting postures
- Breathable mesh seat and back keep airflow moving
- 135° recline, pull-out footrest, and 360° adjustable armrests
- BIFMA X5.1 tested with SGS Class-4 gas lift and 3-year warranty
Dynamic Lumbar
Adaptive lower-back support
2.0" Seat Depth
Sliding seat adjustment
135° Recline
3-position recline lock
360° Armrests
Multi-angle arm support
Pull-Out Footrest
Built for relaxed breaks
Breathable Mesh
Cool, airy sitting comfort
In Stock· Ships within 1-2 business days
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Fast Free U.S. Shipping
30-Day Returns
3-Year Warranty
MADE TO FIT YOUR SETUP
Will Zenpex Fit You?
Check your body size and desk setup before ordering.
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Recommended User Height 5'3"–6'3"160–190 cmBased on verified fit testing.
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Weight Capacity Up to 300 lbUp to 136 kg
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Adjustable Seat Height 17.3–20.3 in44–51.5 cm
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Adjustable Seat Depth 16.5–18.5 in42–47 cm
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Best For Home offices, study spaces, and long work sessions
Still unsure about your fit? Send us your height and desk height—we'll help you check.
Real Setups. Real Comfort. Real Reviews.
Engineered for All-Day Comfort
Every adjustment is designed to help your body stay supported, focused, and comfortable.
Support That Moves With You
Zenpex’s responsive lumbar system follows your posture as you sit upright, lean back, or shift throughout the day. It supports the natural curve of your lower back without feeling rigid, helping reduce pressure during long work and study sessions.
Adjust Your Seat. Recline Your Way.
Adjust the seat depth for a better fit, choose from three recline positions, and pull out the footrest when it’s time to unwind. Zenpex moves easily between focused work and relaxed comfort.
Zenpex Highlights
Adaptive lumbar support that moves with your posture.
Multi-angle neck support for work and recline.
360° armrest adjustment for a more natural fit.
Breathable, durable mesh made for everyday comfort.
SGS Class-4 gas lift for dependable everyday support.
Tested for Everyday Durability
Zenpex is tested to BIFMA X5.1 standards across seat, armrest, footrest, tilt mechanism, structural, and base-load performance. Its stable frame and tested components are built for dependable everyday use.
Seat Durability Cycles
Armrest Durability Cycles
Tilt Mechanism Tests
Footrest Durability Tests
Fast Free U.S. Shipping
Product details
Built to Fit the Way You Sit
Details and dimensions
Explore Zenpex dimensions, adjustability, materials, and package details in one clear view.
Product measurements may vary slightly due to manufacturing tolerances.
Product Name
OTO Zenpex Ergonomic Office Chair
Model
ZP-01
Recommended Height
5'3"–6'3" (160–190 cm)
Maximum Weight Capacity
300 lb (136 kg)
Overall Dimensions
W 28.3" (72 cm)
D 29.5" (75 cm)
H 41.7"–51.2" (106–130 cm)
D 29.5" (75 cm)
H 41.7"–51.2" (106–130 cm)
Seat Width
20.1" / 51 cm
Seat Depth
16.5"–18.5" / 42–47 cm
Seat Height Range
17.3"–20.3" / 44–51.5 cm
Backrest Height
21.7" / 55 cm
Product Weight
40.1 lbs / 18.2 kg
Package Dimensions
30.7" × 26.8" × 15.0"
Gross Weight
48.5 lbs / 22 kg
Headrest
Height and angle adjustable
Headrest Travel
2.0" / 5 cm
Headrest Rotation
Large-axis 70°, small-axis 50°
Backrest Height
4-position height adjustment
Lumbar Support
Adaptive dual-zone lumbar support
Armrests
Height, front-back, and 360° pad rotation
Armrest Height Adjustment
2.6" / 6.5 cm
Armrest Front-Back Adjustment
2.8" / 7 cm
Seat Depth
5-position sliding adjustment (2.0" / 5 cm range)
Recline
3-position recline lock, up to 135°
Chair Rotation
360° swivel
Footrest
Pull-out and flip-up design
Mesh
Wintex M350 breathable mesh
Headrest
Mesh, PA+GF support, aluminum alloy support
Backrest
Mesh, PP+GF frame, aluminum alloy support
Lumbar Support
Mesh with PP+GF outer frame
Armrests
PA+GF structure with PU arm pads
Seat
Mesh with PA+GF seat frame
Gas Lift
SGS Class-4 gas lift
Base
Polished aluminum alloy base
Casters
60 mm PU quiet casters
Standard
BIFMA X5.1-2017
Headrest
1
Backrest
1
Seat Cushion
1
Lumbar Support
1
Gas Lift
1
Chair Base
1
Casters
5
Left Armrest
1
Right Armrest
1
Hardware Kit
1
T-Wrench
1
L-Wrench
1
Product measurements may vary slightly because of manufacturing tolerances. Review the complete dimension diagram before ordering.
What's in the Box
User Guide
Questions About Zenpex?
Part 1 · Product & Fit
Everything about fit, comfort, and daily use.
Is this chair suitable for tall users over 6 feet?
Yes. The chair is designed to accommodate users ranging from 5'3" to 6'3". It features a 2.0" adjustable seat-depth range to provide better thigh support for taller users, plus an adjustable headrest for more comfortable neck support.
How does the "Dynamic Lumbar Support" work?
The OTO Zenpex features a dual dynamic lumbar system that automatically adapts to your posture and the natural curve of your spine. This provides continuous lower back support and reduces pressure during long hours of sitting.
What are the primary materials used in the construction?
The chair uses high-resilience, breathable Wintex M350 mesh across the backrest and seat to maintain airflow. The frame and armrests use durable PA+GF and PP+GF materials, paired with an SGS Class-4 gas lift and a polished aluminum-alloy base.
Can I tilt the chair back for a nap?
Yes. The backrest reclines up to 135° with a three-position recline lock. Combined with the pull-out, flip-up footrest, it lets you move easily from an upright work posture to a more relaxed resting position.
Part 2 · Assembly & Shipping
Setup, packaging, and delivery details.
When will my order ship?
In-stock orders are prepared for shipment within 1–2 business days, excluding weekends and U.S. public holidays. You will receive a shipping confirmation email with tracking information once your order ships.
How long does delivery take?
We offer free standard shipping on all eligible orders to the 48 contiguous United States. Standard delivery usually takes 3–7 business days after the order has shipped, depending on your location.
Part 3 · Warranty & Returns
Coverage, claims, and return conditions.
What kind of warranty coverage does OTO provide?
The chair comes with a 3-year warranty starting from the date of purchase. This covers functional defects and parts replacement, backed by a dedicated support team to assist with any ownership issues.
What is the return policy?
Eligible Zenpex orders may be returned within 30 days under the OTO return policy. The product must be in like-new condition and returned in its original packaging with all accessories.