Haworth Soji vs. COLAMY Atlas: What the Evidence Lets Us Compare

By Karim Majid

The Karim Standard · Research comparison
Published: September 30, 2026

Editorial disclosure: TKS has not physically tested either chair. All source and retailer links are untracked, and TKS earns no commission from them. See our Affiliate Disclosure.

The original COLAMY Atlas has a frozen 76/100 — Good research score. The standard Haworth Soji is unscored, with its recommendation withheld, because its exact configured price and applicable warranty need confirmation. There is no responsible numerical winner between them.

The useful comparison is practical: what adjustments you would actually receive, how the seat and lumbar might suit you, what setup requires, and what happens if the fit is wrong. The Soji assessment and Atlas assessment explain the evidence behind those questions. [1][2]

Match the configurations first

This comparison covers the original Atlas, model XK, not Atlas-01 or Atlas Pro. The Soji research focuses on the standard fabric-seat, mesh-back task chair with 4D arms, adjustable lumbar, and forward tilt, excluding XL, stool, leather, and Cleanable+ variants. TKS has not matched that Soji package to a current online-store SKU and complete price. [1][2]

A low Soji starting price cannot establish the cost of those options. An Atlas family listing cannot establish that a seller is supplying XK. Compare the included equipment on the order before comparing costs.

The table summarizes the individual TKS assessments and manufacturer documentation. It describes available controls, not proof of equivalent range, comfort, or refinement. [1][2][3][4]

Fit could outweigh the feature differences

Soji owner evidence includes a favorable longer-term account from a buyer whose earlier quick-ship chair lacked forward tilt. A different owner liked the firm seat and tilt but returned their chair because the optional lumbar pressed uncomfortably into their back. Those packages and trials differ. [1]

The Atlas evidence also contains disagreement over seat and lumbar feel. Its frozen arm score is 6/8, reflecting reported pad firmness and position-retention concerns alongside useful adjustment. TKS has not established that the Soji’s current arms perform better in a controlled comparison. [2]

For either chair, check where the lumbar meets your back, whether the seat supports your thighs without crowding your knees, and whether the arms support relaxed shoulders at your desk. Optional forward tilt is only an advantage if you use and like it. A headrest’s presence does not add automatic TKS points.

Warranty length does not settle the choice

The Soji store page advertises a 12-year warranty and a 350 lb warranted limit. Its linked policy is effective October 1, 2026 and specifies seating use up to 325 lb. The applicable policy and any Soji exception need confirmation. TKS is not treating the future-effective document as established September 30 coverage. [1][5]

The Atlas warranty identifies three years, with normal wear and foam softening excluded. Its commercial-use language also conflicts. That ambiguity remains disclosed in the existing review without changing its frozen score. [2][6]

A longer headline term can be valuable, but eligibility, component exclusions, and the service you actually receive matter. Neither brand’s warranty establishes fit or guarantees years of comfortable seating.

The return question matters for both

Haworth’s policy offers a 30-day return window for eligible performance chairs and requires the original box. It separately applies a 10% restocking fee to custom/special orders. Confirm how the exact Soji package is classified. [7]

COLAMY’s policy conflicts between an unused/unassembled condition and later wording about like-new, disassembled returns. Confirm whether you may assemble and sit in the XK, then return it for poor fit, and what that would cost. [8]

Do not treat either headline return window as a complete trial agreement. An assembled Soji can save setup work, but keeping and moving its box is still part of the buying decision.

How the scores should be read

The Atlas’s 76/100 is an existing provisional research judgment, not a score from a new comparison test. All 11 category points remain unchanged. Soji points are missing because the assessment is unscored; they are not zeroes.

The Atlas’s 13/15 value score uses its documented roughly $300 price basis. No Soji value score or price premium has been calculated. Neither chair has completed TKS physical testing or receives the TKS seal. See our methodology.

The present buying decision

Investigate the Atlas if roughly $300 is your budget and its adjustment package addresses a real need. The frozen research conclusion supports a qualified shortlist position, subject to fit and return clarity.

Investigate the Soji if assembled delivery or the available forward tilt matters to you. Establish the exact package price, current warranty, and trial eligibility first. TKS is withholding a Soji purchase recommendation and has not shown that paying more for it produces a better overall result.

If you cannot establish a workable fit trial or the terms relevant to your use, neither assessment supplies the missing certainty. Further evidence may change the conclusions under the Score Freeze Rule; affiliate availability will not.

Sources and evidence limits

This comparison reuses the dated TKS assessments. It does not add a sitting test, establish failure rates, or transfer older owner experiences to an unidentified current revision. Direct manufacturer sources support features and purchase terms; TKS makes the comparative judgment.

1. TKS: Haworth Soji Research Preview — configuration limits, fit figures, individual ownership evidence, unresolved coverage, and unscored status.
2. TKS: Original COLAMY Atlas Research Preview — XK identity, frozen score, dated price, and evidence limitations.
3. Haworth: Soji product sheet — movement and available options.
4. COLAMY: Atlas/XK manual — adjustment and assembly instructions.
5. Haworth: linked online warranty, effective October 1, 2026 — future effective date and seating weight limit.
6. COLAMY: Warranty Information — coverage and exclusions.
7. Haworth Store: refund policy — packaging and custom-order terms.
8. COLAMY: Return & Refunds — conflicting condition requirements.