Sihoo B300 Pro Chair Promoted for Under $300 in 9to5Mac Report

The 9to5Mac report says the B300 Pro centers on adjustability. It combines 4D MicroFit Lumbar Support, 6D All-around Armrests, backrest and seat depth adjustments, an intelligent recline system, and breathable mesh. The article says these features give users more ways to tailor the chair to their body and the way they work.

The lumbar support is described as the starting point. The 4D MicroFit system lets users adjust height and depth, with movement designed to follow the back as the user shifts position. According to the report, this gives control over where the support sits, whether the user is upright at a keyboard or leaning back between tasks. The article says two people can use the same desk and display while needing different support from the chair underneath them.

The 6D All-around Armrests are said to rotate, adjust, and flip up. The report says this provides options when moving between desk work and a more relaxed position, and allows the armrests to be moved out of the way when more room is needed. The article notes that hands often change position during the day, from keyboard and trackpad to an iPad for reviewing notes and then an iPhone for a call, and adjustable armrests let the chair change configuration alongside those activities.

Backrest and seat depth adjustments add another layer. The article states the backrest offers 2.2 inches of height adjustment, while seat depth ranges from 16.5 to 18.5 inches. The report says these separate controls allow users to fine-tune more than the distance between the seat and the floor, and that this flexibility can be especially appealing in a home office when choosing a chair for an existing desk.

For reclining, the intelligent recline system uses a weight-adaptive mechanism to adjust resistance automatically, according to the article. It also includes three lockable recline angles: 105, 120, and 135 degrees. The report says users can choose a position for working at a desk or taking a break, making reclining part of the chair's everyday controls during focused typing, reading a long document, or stepping back to think through a project.

The chair also uses breathable mesh. The 9to5Mac report says the mesh seat and back allow airflow, with a flexible surface designed to provide support. The article describes this as a practical feature for a chair that may be used beyond office hours, from a morning inbox check to an evening personal project.

The black Sihoo B300 Pro without a footrest is priced at $269.99 under this promotion. The code SIHOO9to5M brings the price to $253.79. The article directs readers to the Sihoo store to learn more and shop, and says the B300 Pro is also available on Amazon.

Editor's Summary The Sept. 16, 2026, 9to5Mac article highlights the Sihoo B300 Pro's adjustable lumbar support, armrests, backrest, seat depth, recline and mesh design, and promotes the black model without a footrest at $269.99, or $253.79 with code SIHOO9to5M. It positions the chair as part of a Mac desk setup rather than as a standalone product announcement. The promotion details and product descriptions come from that single report.