Office Chair Backrest Chair (Large)

There is currently no publicly available information on the specific dimensions or other details of the 'Office Chair Backrest Chair (Large)'. However, we can provide a科普 (popular science) explanation from the perspective of improving sitting comfort and protecting the lumbar spine, based on the design features of office chairs known as 'invisible backrest chairs' in the market.

Core Design Principles of Invisible Backrest Chairs

Some office chairs referred to as 'invisible backrest chairs' focus on ergonomic principles in their design. They aim to improve sitting posture and reduce physical strain from prolonged sitting through scientific support structures. For example, the KYOLENS ergonomic lumbar support cushion follows a two-step design logic:

1. Pelvic Positioning: By using a slightly upward-curved bottom, it supports the sitting bones and helps maintain the pelvis in a neutral position. The pelvis serves as the base of the spine, and a neutral position prevents anterior or posterior pelvic tilt, thereby reducing compensatory lumbar spine curvature.
2. Lumbar Spine Alignment: With a stable pelvis, the lumbar spine can naturally align with the backrest, distributing the pressure of the upper body and reducing the risk of lumbar disc compression. This design improves sitting posture and alleviates lower back pain by 'first correcting the pelvis and then protecting the lumbar spine'.

Potential Considerations for Size Design

Although specific size data for the 'Office Chair Backrest Chair (Large)' is lacking, the size design of such chairs typically adheres to the following principles:

• Seat Depth: Should cover more than two-thirds of the back of the thighs to prevent the buttocks from sliding forward or pressure on the thighs.
• Seat Height: Should allow the feet to rest flat on the ground with the knees bent at 90°-100°, reducing lower limb circulation problems.
• Backrest Height: Should provide support up to below the shoulder blades, complementing the lumbar spine curve for comprehensive support.
• Width: Typically 5-10 cm wider than the widest part of the buttocks to ensure activity space without restricting posture adjustments.

Selection Recommendations

When selecting such chairs, prioritize ergonomic certification (such as BIFMA standards), adjustability (such as seat height, backrest angle, armrest height), and material breathability rather than simply pursuing 'large size'. For example, the KYOLENS cushion achieves support through structural optimization rather than simply enlarging its volume, aligning more with scientific design principles.