A modern ergonomic office chair in a gray mesh fabric sits next to a wooden height-adjustable desk in a bright, contemporary home office setting.
A modern black mesh ergonomic office chair with a headrest, adjustable armrests, and a chrome five-star wheeled base, shown on a clean white background.
Product dimension diagram of a black ergonomic mesh office chair with silver five-star base, showing front and side views with labeled measurements on a light gray background.
Chair adjustment mechanism with text highlighting control features on a gray background
An ergonomic office chair seat cushion and backrest mesh system shown with a barbell above and a blue wireframe illustration of breathable mesh material. Text at the top reads 'Premium Imported Mesh Material' and 'Breathable, High-elastic Seat Cushion & Durable Backrest Mesh.
Ergonomic chair with adjustable features on a gray background
Ergonomic chair with 4-level angle locking system demonstrating different usage scenarios.
Ergonomic chair in a home office setup with dual monitors and gaming equipment.
Multifunctional office chair with adjustable features on a gray background
L1 Ergo Upgrade 518 Ergonomic Office Chair — product photo

L1 Ergo Upgrade 518 Ergonomic Office Chair

Sale price$329.00 Regular price$399.00
Save $70.00
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One Chair. Every Body.

The L1 Ergo Upgrade 518 is a full-mesh ergonomic chair built for the full spectrum of body types — from 5'3" to 6'3" — with 6 independent adjustments, a dynamic-follow lumbar system and a 4-gear backrest that lets the chair adapt to you, not the other way around.

Full Control at Your Fingertips

Forget groping under the seat for levers. The 518 uses a performance-car-inspired wire control system: a paddle-style controller wired to the mechanism lets you adjust seat depth, seat height and backrest tension without bending or reaching. One touch, done.

Lumbar That Follows You

The dynamic-follow lumbar support mirrors the curve of your spine as you shift between sitting positions, continuously cradling your lower back and cutting pressure during marathon work sessions. It's not a bump you sit against — it's support that moves with you.

Four Angles, Four Modes

A 4-level angle locking system maps to how you actually spend your day: 90° Focus for deep work, 108° Meeting Ready for collaboration, 115° Leisure for reading, and 135° Power Nap for a real break. Lock in any angle and stay supported.

Built for the Long Sit

Premium imported mesh delivers 350 lbs of rated strength, high elasticity and all-day breathability — no more heat buildup after hour three. The backrest holds its shape session after session, year after year.

Dialed-In Adjustability

4-gear backrest height (2.7" range), sliding seat depth, 2D headrest (height + angle) and 3D armrests (height, rotation, fore-aft): every contact point lands where your body needs it.

Thoughtful by Design

A built-in coat hanger on the backrest keeps your jacket within reach, and silent caster wheels glide smoothly across floors and carpet without a sound.

Item Spec
Overall height 46.1"–54.3"
Seat height adjustment 18.9"–22.8"
Seat depth (sliding) 19.7"–21.3"
Seat width 20.1"
Backrest 20.1"W × 29.5"–31.5"H, 4-gear height adjustment (2.7" range)
Headrest 15"W × 7.5"H, 2D adjustable (height/angle)
Armrests 11.2"L × 3.9"W, 3D adjustable (height/rotation/fore-aft)
Recline 90°/108°/115°/135°, 4-level lockable
Weight capacity 350 lbs
Mesh Premium imported high-tenacity breathable mesh (FlexBreath grade)
Adjustment system WireControl (racing paddle-style)
Base Five-star, 28.7" diameter, silent casters
Special feature Integrated coat hanger on backrest

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