Sihoo M18 Ergonomic Office Chair with Adjustable Lumbar Support & Headrest

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Upgrade your workspace with the Sihoo M18 Ergonomic Office Chair, engineered to provide comprehensive support and comfort for long hours of work. Featuring a highly durable PP material frame, the backrest is designed with an S-shaped curve that perfectly traces and supports the natural alignment of your spine. The chair is upholstered in a premium polyester mesh that is highly breathable, tear-resistant, and fade-resistant, ensuring long-lasting performance. Paired with a high-density sponge seat cushion supported by a robust multi-layer board, the M18 offers the ideal balance of softness and structural stability.

Dimensions & Weight:

Standard / Upgraded Wheels: Package Size: 70 × 27.5 × 53.5 cm | Weight: 19.45 kg / 20.0 kg.

Product features

Ergonomic S-Shaped Backrest: Fully supports the back and spine, providing a comfortable experience whether you are sitting upright or reclining.

Customizable Lumbar Support: The PP lumbar pillow is wrapped in a thick sponge and can be adjusted 5.5cm vertically and 4.5cm horizontally to deliver strong, targeted lower back support.

Multi-Dimensional Headrest: Made of PP material, the headrest adjusts 8cm in height and rotates up to 45 degrees to perfectly cradle your neck in various postures.

Advanced Tilt Mechanism: Features a thick steel 3-gear locking mechanism that allows you to lock the recline angle at 108°, 118°, or 128° (0°, 10°, 20° from the base), alongside adjustable tilt tension.

Height-Adjustable Armrests: Built with a sturdy steel and nylon frame, the armrests feature soft PU padded surfaces and can be adjusted 7cm in height to relax your arms and shoulders.

Premium Gas Lift & Base: Equipped with an SGS and BIFMA-tested Class 3 electroplated gas lift for safe height adjustments (45cm to 53cm seat height). The foundation is a strong 70cm diameter electroplated iron base that has passed a 1136kg static pressure test.

Smooth & Quiet Casters: Designed to glide silently and flexibly across the room while preventing scratches on your flooring.

Materials and care

Materials: Polypropylene (PP) backrest and headrest frame, premium polyester breathable mesh, high-density (40-density/65-hardness) raw sponge seat cushion, steel/nylon armrest frame with PU surface, and an electroplated iron base.

Care Instructions: Always place the chair on a flat, even surface. Keep the chair away from open flames and avoid using sharp or hooked objects that could scratch the mesh or frame. Do not place heavy objects on the chair, and do not stand on it or use it as a step ladder or pushcart.

Merchandising tips

B2B & Retail Pitching: When presenting this model to commercial buyers or large retail partners, heavily emphasize the SGS and BIFMA testing certifications, as these are critical trust signals for durability, weight capacity (136kg backrest pull test), and safety in corporate environments.

Visual Focus: Ensure your Shopify image gallery includes close-ups of the adjustable lumbar support and the 3-gear tilt mechanism. Visualizing the 4.5cm depth adjustment of the lumbar pillow helps communicate the personalized comfort it offers over standard chairs.

Target Audience Messaging: Position this chair directly toward remote professionals, IT teams, and e-commerce administrators who require long-term seating without fatigue. Highlight the thick sponge lumbar support and breathable polyester mesh as solutions for all-day focus.