I. Orthopedic Innovation: Precision Lumbar & Spinal SupportThe JHK Ergonomic Series is built upon the science of human kinetics. Recognizing that traditional office chairs often lead to "Slump Syndrome," JHK has engineered a backrest that actively promotes a healthy posture.Natural S-Curve Alignment: The ergonomically designed backrest features prominent, built-in lumbar support. This is specifically shaped to mirror the "Natural Curvature of the Spine," providing a constant tactile reminder for the body to maintain its optimal alignment.Mid-Back Excellence: By focusing on the thoracic and lumbar regions, this "Computer Desk Chair" reduces the pressure on the lower vertebrae, effectively preventing the onset of chronic back pain and stiffness during long sessions of "Specific Use" in the office.Head & Neck Optimization: The Unique Adjustable Headrest is a standout feature. Unlike fixed headrests, this component allows you to customize both the height and the angle. By providing targeted support to the cervical spine, it eliminates the "Forward Head" posture often caused by staring at monitors, helping you avoid neck soreness and tension headaches.II. Advanced Material Science: Breathable "Lacework" & High-Density FoamJHK prioritizes the sensory experience of the user through the selection of premium materials.Premium Mesh "Lacework": The backrest utilizes a skin-friendly, all-elastic premium mesh. This "Lacework" material acts as a natural ventilation system, allowing air to circulate freely. Even during the peak of summer or high-stress deadlines, you remain cool and dry, avoiding the "sticky" discomfort associated with leather or vinyl executive chairs.High-Density Sponge Seat: The seat cushion is packed with a high-resiliency sponge that provides a medium-firm feel. This "Comfortable Seat" is designed to distribute weight evenly across the hips and thighs, preventing pressure points and ensuring that the cushion retains its shape and "Comfort" even after years of daily use.Eco-Friendly Construction: With None high-concerned chemicals, the chair is safe for indoor environments, ensuring that no harmful VOCs are released into your study room or bedroom.III. Space-Saving Flip-Up Armrests: The Ultimate UtilityOne of the most innovative features of the JHK Swivel Chair is its adaptive armrest system.Freedom of Movement: The "Flip-up Arms" provide soft, padded support when you are typing or resting. However, for tasks that require closer proximity to the desk—such as gaming or precision drawing—the arms can be flipped up and out of the way.Efficient Storage: Most office chairs are difficult to tuck away. With the arms in the "Up" position, this chair can slide completely under your desk, effectively reclaiming valuable floor space in small apartments, bedrooms, or crowded "Office Furniture" environments.IV. Multifunctional Mechanism: Customizing Your ComfortThe JHK chair is a "Dynamic" seating solution that adapts to your body’s needs throughout the workday.Pneumatic Height Adjustment: Using a high-grade pneumatic lever, the seat height can be adjusted from 18.5 to 22.2 inches. This "Adjustable Height" feature ensures that your feet remain flat on the floor, which is essential for healthy blood circulation in the legs.Rocking & Relaxation Mode: Work shouldn't be all about tension. The "Multifunctional Mechanism" supports a rocking mode ranging from 107° to 144°. Whether you need to lean back for a phone call or tilt back to brainstorm your next big idea, the tension control allows for a smooth, balanced recline.360° Swivel & Heavy-Duty Base: The "Is Rotatable" feature allows you to pivot effortlessly to reach files, printers, or coworkers. This is supported by a large 5-Star Base that guarantees stability even when the chair is at its maximum height.V. Smooth Movement & Rapid AssemblyJHK ensures that the experience from unboxing to sitting is as seamless as possible.Multi-Directional Casters: The high-quality rollers are designed for silent and "Smooth Movement." They glide effortlessly across varied surfaces, including Tile, Wooden Floors, and Carpets, without leaving unsightly scratches or marks.250 lbs Weight Capacity: The heavy-duty "Executive Chair" construction is built to support a maximum weight of 250 lbs, making it a robust choice for "General Use" in commercial settings.10-15 Minute Assembly: Time is money. The "Assembly" method is streamlined with all "Necessary Hardware & Tools" included in the box. With the provided video guide and clear instructions, you can transition from "Package" to "Productive" in less than 15 minutes.Comprehensive Technical Specifications TableComponent / FeatureDetailed Specification & GradeBrand / ManufacturerJHK Ergonomic SolutionsType / ClassificationOffice Furniture / Executive Swivel ChairBackrest HeightHigh-Back (Up to 800mm Support)Armrest TypeSpace-Saving Flip-Up (Padded)Lumbar SupportDynamic Ergonomic S-Curve DesignSeat MaterialHigh-Density Breathable SpongeBack MaterialHigh-Elasticity Lacework MeshHeight Range18.5" – 22.2" (Adjustable)Recline Range107° to 144° Rocking ModeBase ConstructionLarge Reinforced 5-Star Stability BaseWeight Capacity250 lbs (Heavy Duty)Rotation360° Full SwivelInstallationDIY Assembly (10-15 Mins) 【Ergonomic Lumbar Support】The ergonomically designed backrest of our ergonomic office chair has prominent lumbar support to fit the natural curvature of the spine. The Computer Desk Chair with mid-back brings quality and comfort to any office. 【Comfortable Seat】Ergonomic features an all-elastic premium mesh back and a high-density sponge seat making the mesh office chair a good choice for all-day comfortable office seating. The unique mesh design is skin-friendly and breathable, which keeps you cool all day. 【Space-saving】Flip-up armrests are available and won't be in your way when not in use. The Armrests of the computer chair provide comfortable support for your arms and can be flipped up to save space effectively while not in use. It is perfect for the office, bedroom, study room, living room, or gaming room. 【Adjustable Headrest】The Unique Headrest easily adjusts to your requirements. More support for the head and neck can be provided by adjusting the height and angle of the headrest, which can make you feel comfortable and help you avoid soreness from your neck and back! 【Multifunctional Mechanism】The seat height of this 360° Rotating chair could be easily adjusted by the pneumatic adjustment lever, and the adjustment range is 18.5-22.2 inches. Besides, the rocking mode from 107° to 144° helps you to relax from hard work. 【Smooth Movement & Stability】Our comfy office desk chair comes with smooth and multi-direction casters, which allow you to move the chair around effortlessly. They can run smoothly on tile, wooden floors, carpets, and other floorings. The large 5-star base increases stability even at the full height range. The maximum weight capacity is 250 lbs. 【Easy Assembly】The home office chair comes with installation instructions and all necessary hardware& tools. We also offer a video to help you, allowing the office chair installation to be completed within 10-15 minutes