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HKM-118803 Ergonomic High Back Leather Task Chair with 4D Adjustable Armrests for Office Use
HKM-118803 High Back Leather Task Chair
A meticulously engineered seating solution that fuses premium leather craftsmanship with advanced ergonomic science — built for professionals who demand enduring comfort through the longest workdays.
Model: HKM-118803
Why It Matters
Designed around the human spine, built for the modern workspace.
Extended sitting is an unavoidable reality of contemporary professional life. Research from leading occupational health institutes consistently shows that poorly designed seating contributes to cumulative spinal fatigue, reduced circulation, and diminished cognitive focus over time. The HKM-118803 addresses these challenges at the structural level — every contour, every adjustment mechanism, and every material choice has been informed by biomechanical data and user experience testing. The result is a chair that actively supports healthy posture without demanding conscious effort from the user.
High Backrest with Spinal Alignment
The elevated backrest traces the natural S-curve of the spine, providing continuous support from the lumbar region through the thoracic zone. This distributes upper-body weight evenly and discourages slouching even during long sessions.
4D Adjustable Armrests
Move them up/down, forward/back, left/right, and pivot them inward or outward. This four-dimensional freedom lets you fine-tune arm support for typing, reading, or video conferencing — dramatically reducing shoulder and wrist strain.
Signature Feature
4D Armrest Technology: Precision at Your Fingertips.
Most office chairs offer only height adjustment — a one-dimensional solution to a three-dimensional problem. The HKM-118803's 4D armrest system represents a fundamental rethink of how arm support should function. Each armrest operates across four independent axes, allowing you to create a truly personalized support envelope that mirrors your unique body geometry and work style.
Vertical Adjustment
Raise or lower each armrest independently to match your elbow height, ensuring your forearms rest parallel to the desk surface.
Fore-Aft Slide
Slide the armrest pads forward or backward to support your forearms whether you're leaning in for detailed work or reclining to think.
Lateral & Pivot
Shift armrests sideways for broader support, and rotate them to match the natural angle of your arms during different tasks.
Materials & Durability
Premium leather that ages gracefully.
The upholstery is not merely a cosmetic layer — it is a high-performance surface engineered for daily use. Selected for its balance of softness and tensile strength, the leather resists cracking, peeling, and abrasion far longer than bonded alternatives. Its subtle grain texture provides a tactile warmth that synthetic materials cannot replicate, while remaining breathable enough to prevent heat buildup during extended seating.
Genuine Leather Upholstery
Sourced through strict quality protocols, the leather hide offers a refined matte sheen that complements both executive suites and contemporary open-plan offices. It is treated with a protective topcoat that guards against incidental spills and UV-induced fading, preserving its appearance through years of use.
High-Density Foam Cushioning
Beneath the leather sits a multi-layer foam core with a density calibrated to resist permanent compression. Unlike cheaper single-density foams that flatten within months, this layered construction maintains its resilience, providing consistent support from day one through year five and beyond.
The Science of Sitting
Ergonomics that work while you work.
Ergonomics is not about adding lumbar bumps or headrests as afterthoughts — it is a holistic discipline that considers the entire kinetic chain from pelvis to cervical spine. The HKM-118803 integrates several evidence-based design principles into a cohesive whole, encouraging what occupational therapists call "active sitting" — a state where the body is supported yet free to make micro-adjustments throughout the day.
Did You Know?
Studies published in ergonomics journals indicate that users who alternate between upright and slightly reclined postures throughout the day report up to 40% less lower-back discomfort compared to those who remain fixed in a single position. The HKM-118803's responsive tilt mechanism facilitates these healthy posture shifts naturally.
Lumbar Curve Mimicry
The backrest's subtle convexity at the lower region mirrors the natural lordotic curve, filling the gap between the chair and your lower back to prevent the pelvis from rotating posteriorly.
Pressure Distribution
The seat pan's waterfall edge reduces pressure on the underside of the thighs, promoting healthy blood circulation to the lower extremities during prolonged sitting.
Technical Specifications
Every dimension, every tolerance, every detail.
Transparent specifications so you can make an informed decision. All measurements reflect the production standard for the HKM-118803.
Workspace Integration
Adapts to your environment, not the other way around.
Whether your office is a dedicated corner suite, a shared coworking hub, or a compact home setup, the HKM-118803's understated design language and neutral palette allow it to integrate without visual friction. The high backrest creates a defined personal zone that signals focus, while the refined leather finish elevates the overall aesthetic of any room.
Executive Office Ready
The chair's commanding silhouette and genuine leather presence make it a natural centerpiece for private offices, boardrooms, and executive suites where first impressions count.
Home Office Optimization
For remote professionals, the chair creates a psychological boundary between work and leisure — an ergonomic anchor that helps you stay productive without sacrificing the comfort of home.
Frequently Asked Questions
Everything you need to know.
What does "4D adjustable armrest" actually mean?
4D refers to four independent axes of adjustment: vertical (up and down to match elbow height), horizontal fore-aft (slide forward or backward to support different forearm positions), lateral (shift left or right for broader or narrower support), and pivot/rotation (angle the pad inward or outward to match the natural orientation of your arms). This level of adjustability is a hallmark of premium ergonomic seating and is particularly beneficial for users who switch between tasks such as typing, using a mouse, writing, and video conferencing throughout the day.
Is the leather genuine or synthetic?
The HKM-118803 features genuine leather upholstery on all primary contact surfaces. Genuine leather is prized for its breathability, natural grain texture, and ability to develop a rich patina over time. It is treated with a protective topcoat that guards against everyday spills and UV exposure. For longevity, we recommend occasional conditioning with a quality leather care product and keeping the chair away from direct heat sources.
What height range is this chair suitable for?
The HKM-118803's seat height adjusts from approximately 17.7 inches (45 cm) to 21.7 inches (55 cm) from the floor. Combined with the high backrest, the chair comfortably accommodates users ranging from roughly 5 ft 2 in (157 cm) to 6 ft 4 in (193 cm). The 4D armrests and responsive tilt mechanism further extend the fit range by allowing fine-tuned customization for different body proportions.
How does the tilt mechanism work?
The chair employs a synchro-tilt mechanism, meaning the backrest and seat pan recline in a synchronized ratio — as you lean back, the seat tilts at a slightly lower rate, keeping your feet grounded and your eyes aligned with your monitor. The tilt tension is adjustable via a knob beneath the seat, allowing you to set the resistance to match your body weight and preferred recline feel. The mechanism can also be locked in an upright position when desired.
Does the chair require assembly?
Yes, some assembly is required. The HKM-118803 ships in a single carton with all necessary hardware and an illustrated step-by-step guide. Typical assembly involves attaching the casters to the base, mounting the gas lift cylinder, securing the seat mechanism, and bolting on the backrest and armrests. Most users complete the process in 20–30 minutes with no specialty tools needed. A standard Phillips-head screwdriver is the only tool you'll need.
How does this chair compare to mesh-backed alternatives?
Mesh-backed chairs prioritize airflow and are often lighter in weight, making them popular in warmer climates. The HKM-118803's leather-and-foam construction offers distinct advantages: superior acoustic dampening (less creaking), a more anchored and substantial feel, and a warmer tactile experience during cooler months. The high-density foam also provides more consistent pressure distribution across the full contact area compared to tensioned mesh, which can create pressure points at the frame edges for some users.
Purchase With Confidence
Your satisfaction, our commitment.
Free Shipping
Complimentary shipping on all orders with no minimum purchase required. Delivered safely to your doorstep.
180-Day Purchase Protection
Extended coverage against manufacturing defects for a full six months beyond your purchase date.
30-Day Money-Back Guarantee
Not completely satisfied? Return the chair within 30 days for a full refund — no questions asked.
24-Month Warranty Service
Comprehensive warranty coverage for two full years, including parts and service for any covered defect.
Every product we offer includes a 180-day purchase protection plan at no additional cost. This coverage extends beyond a standard warranty, reflecting our confidence in product quality and our ongoing commitment to your satisfaction.
The protection plan is designed to provide practical help in real-world situations. Whether you encounter a manufacturing issue, a performance problem, or an unexpected accident, our team is ready to assist with clear, fair solutions.
What Is Covered
Manufacturing Defects
We replace items with material or workmanship flaws at no charge.
Performance Failures
Free repair or replacement if the product fails under normal use.
Accidental Damage
One-time courtesy replacement at a reduced price.
Zero Hidden Fees
All shipping costs for replacements and returns are covered.
How to File a Claim
How This Differs from the Warranty
The 180-day purchase protection includes accidental damage and performance failures that are typically not covered by a standard warranty. It provides an additional layer of support during the first six months after purchase, giving you greater confidence and peace of mind.
We want you to be completely satisfied with your purchase. If for any reason you are not fully happy, you may return your item within 30 days of delivery for a full refund. No lengthy forms, no unnecessary questions.
Our return policy is built on a simple principle: if the product is not right for you, we will make it right. We understand that online shopping involves trust, and we work hard to earn that trust with every order.
Return Eligibility
30-Day Window
Request a return within 30 days of delivery.
Original Condition
Unworn or unused, with tags and original packaging.
Proof of Purchase
A receipt or order number is required.
Fast Refund
Refund processed within 10 business days.
How to Start a Return
Returns & Exchanges Overview
Damages & Exchanges
Please inspect your order as soon as it arrives. If the item is defective, damaged, or incorrect, contact us immediately so we can evaluate the issue and make it right. For exchanges, the fastest option is to return the original item and place a new order for the replacement.
We believe in the quality of our products, and we want you to share that confidence. Every product is backed by a 24-month warranty covering all structural and functional components, including zippers, buckles, straps, and fabric integrity.
The warranty is designed to be simple and accessible. You only need your proof of purchase to begin a claim, and our team will assess the issue promptly. If a manufacturing issue arises, we will make it right.
What the Warranty Covers
Comprehensive Coverage
Every part warranted for two full years.
Free Repair or Replacement
Whichever is faster, at no cost to you.
Quick Turnaround
Claims assessed within 1 business day.
Transferable
Warranty follows the product, not the owner.
How to File a Warranty Claim
Every order ships free—no minimums, no hidden fees. We currently deliver across the United States and are actively working to expand to more countries. We partner with reliable U.S. courier services to ensure your order arrives safely and on time.
Our delivery process is designed for transparency. From the moment you place your order to the moment it reaches your door, you receive clear updates at every stage. We carefully inspect each product before dispatch, and we provide tracking information as soon as your order ships.
Our U.S. Shipping Partners
USPS
Official national carrier with nationwide coverage.
UPS
Fast and reliable ground and express shipping.
FedEx
Express delivery with real-time tracking.
DHL eCommerce
Efficient parcel delivery for e-commerce shipments.
Delivery Process
Delivery Time Summary
Cancellations & Taxes
You may cancel your order at any time before it ships. All product prices include applicable taxes, and there are no additional VAT or customs fees for orders delivered within the United States.
Whether you have a question, need help with an order, or just want some advice, our support team is available around the clock. We don't just respond to messages—we work with you to find real solutions that fit your needs.
Our support specialists are trained to handle a wide range of requests, from product recommendations to technical troubleshooting. No matter the question, you can expect a professional and friendly response.
How We Can Help
Product Guidance
Our experts help you choose the right product.
Order Assistance
Modify orders, track shipments, or speed up delivery.
Warranty & Returns
Start claims or returns quickly and easily.
Technical Troubleshooting
Step-by-step solutions for product issues.
Contact Information
24/7 Phone
+1 (209) 280-3200
support@hekomart.com
Address
3401 Dale Rd, Modesto, CA 95356
Support Hours
Available 24 hours a day, 7 days a week
