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Review of Office Chairs

Admin October 08, 2026

The SumLush Xia Mumu Fit CC and Fit2 ergonomic office chairs each have their own advantages in terms of lumbar support performance, seating comfort, and functional design, allowing you to choose based on your budget and needs. The following analysis is conducted from three aspects: core performance, comfort, and adjustment functions.

1. Lumbar Support Performance: Fit2 has more advanced technology and more prominent lumbar support effects
The Fit CC adopts the ZeroG Flow Dynamic Lumbar Support System, integrating three major technologies: BackFit four-way back-waist fitting, S-Flex dynamic spinal pressure distribution, and FullSup full-back support. BackFit achieves back-waist fitting through four-way (up-down, front-back) adjustments. S-Flex disperses the force on the back, and FullSup expands the back support range. In actual use, there is a significant sense of lumbar support, and the lumbar support can provide continuous support when sitting upright or leaning back.
The Fit2 is equipped with the ZeroG 2.0 Dynamic Lumbar Support System, combining an automatic three-zone floating wing lumbar-tracking design, S-Flex six-zone spinal pressure distribution technology, and the MTM floating fine-adjustment support module. Its core advantage lies in precisely dispersing lumbar pressure through a precise support system. Authoritative tests show a 99% reduction in lumbar spine injury rate, a 160% increase in lumbar muscle support force, and a 120% increase in support response speed, reaching the industry's top level in lumbar support effects.

2. Seating Comfort: Fit CC has a wider seat surface, while Fit2 has better materials
The Fit CC adopts the BAS Human Body Adaptation Space System, with a seat surface width of 65.5 cm and a support depth of about 51 cm. Paired with a CloudSeat cloud-like pressure-relieving cushion about 7 cm thick, the buttocks and thighs can fully stretch, making it suitable for people with larger body types or those pursuing a spacious seating feel.
The Fit2 uses NanoFlex4.0 technology mesh fabric and a six-way rebound cloud-like seat cushion. The mesh fabric has excellent breathability, and the seat cushion has strong rebound properties. The overall structure has undergone thousands of disassembly optimizations to ensure no deformation during long-term use, with superior comfort and durability.

3. Adjustment Functions: Fit2 has stronger scene adaptability
The adjustment functions of the Fit CC focus on lumbar support and seat surface adaptation, meeting basic ergonomic needs.
The adjustment design of the Fit2 is more user-friendly. In addition to the ZeroG 2.0 lumbar support system and automatic three-zone lumbar-tracking design, the backrest supports 145ยฐ infinite recline, the 3D adjustable pressure-relieving headrest and 6D linkage armrests can adapt to different sitting postures, and the hidden telescopic leg rest can also meet the needs of multiple scenarios such as office work, study, and rest, with far more comprehensive functionality than products in the same price range.

Summary: If you have a limited budget and pursue basic lumbar support and a spacious seating feel, the Fit CC is a cost-effective choice in the hundred-yuan range. If you have a sufficient budget and need top-notch lumbar support effects and all-scenario adaptability, the mid-to-high-end configuration of the Fit2 is more worth investing in.