If you spend hours at a desk, your chair is more than furniture - it’s a productivity tool. PB Tech has just expanded its line-up with a new range of Sihoo ergonomic chairs, spanning entry-level value through to a flagship model with a space-age ‘anti-gravity’ recline. Below, we break down what’s new, what matters, and which chair will fit your body, workflow, and budget.
The line‑up at a glance
Sihoo Doro C100 (with footrest) - weight-sensing recline, dynamic lumbar that moves with you, coordinated multi-direction armrests. A balanced “do-everything” task chair for focused work with genuine all-day comfort.
Sihoo M90B-401 (with footrest) - breathable mesh build, linked/3D armrests, adjustable headrest, and a robust frame rated up to 330 lb (approx. 150 kg). A value-packed option that still reclines for breaks.
Sihoo Doro S300 (with footrest) - Sihoo’s premium showpiece featuring an “Anti-Gravity Mechanism” with aerospace-grade glass-fibre plates, dual dynamic lumbar, 6D armrests, and seat-depth adjustment.
Sihoo M56-301 - the value workhorse: flexible lifting backrest, adjustable “butterfly” lumbar, and a W-shaped contoured cushion designed for long sitting.
Sihoo M102C-M101 - plush, wider cushion plus 3D flip-up armrests and height/angle headrest. An easy pick for mixed work-and-study setups and tight spaces (flip the arms and slide it under the desk).
What’s special about Sihoo’s approach to ergonomics?
Adaptive support is the through-line. Rather than static pads and levers you set once and forget (until your back complains), multiple models here actively track your posture and redistribute support as you move. For example, the Doro C100’s dynamic lumbar uses a BM (Body Movement) tracking system so the lower-back pad follows you from upright typing to a relaxed lean without manual tweaking. Its weight-sensing chassis also balances the recline tension automatically - so you feel “held” rather than pushed or pulled.
At the top end, the Doro S300 goes further with an Anti-Gravity Mechanism that uses aerospace-grade glass-fibre elastic plates to create a near-weightless recline feel, along with a dual dynamic lumbar that “wings” around your lower back and a 6D armrest system that lines up with your elbows through a wide range of positions. It’s also BIFMA/SGS certified and packs thoughtful touches like a seat-depth slider, a spacious integrated headrest, and a shock-absorbing suspension in the seat base.
If you’re shopping mid-range, the M90B-401 offers linked (3D) armrests that track with the recline, breathable full-mesh materials, and a headrest with dual-joint adjustment - plus a 330 lb max load rating that instils confidence and broadens the fit range.
For tighter budgets, the M56-301 focuses on fundamentals done right: an adjustable headrest, height-adjustable back, and “butterfly” lumbar pad you can slide to match your spine - all on top of a W-shaped cushion that spreads pressure across your hips and thighs.
Prefer cushioned comfort over all-mesh? The M102C-M101 leans into a wider, thicker seat cushion and 3D flip-up armrests (rotate, slide, and flip to tuck the chair away). There’s also 6 cm of vertical lumbar adjustment, plus a height/angle headrest for targeted cervical support.
Model-by-model: Who each chair is for
Sihoo Doro C100 - the “everyday pro” task chair
If you want a chair that stays comfortable from your first email to your last meeting - and you like the idea of support that adapts rather than nagging you to adjust it - the C100 is a sweet spot. Its dynamic lumbar and weight-sensing recline keep resistance in the Goldilocks zone without fiddly dials, while coordinated, multi-direction armrests make it easy to keep wrists neutral whether you’re typing, sketching, or gaming after hours. Add the stowable footrest for off-desk reading and micro-breaks. The C100 is rated for users roughly 150-180 cm and up to 136 kg, so it works for a wide slice of body types. It’s also BIFMA/TUV tested for peace of mind.
Sihoo M90B-401 - value mesh with real adjustability (and a footrest)
The M90B-401 brings a lot of spec for the money: breathable mesh, 3D/linked armrests that support your elbows as you lean back, a double-joint headrest for precise neck cradling, and an adjustable backrest height for better lumbar targeting. The rated load up to 330 lb underscores the sturdiness. The integrated footrest is great for quick recline breaks between tasks. If you’re stepping up from a basic task chair, this feels like a revelation.
Sihoo Doro S300 - flagship “anti-gravity” comfort
This is Sihoo’s statement piece, and it shows. The Anti-Gravity Mechanism - built on aerospace-grade glass-fibre elastic plates - evens out pressure through the recline so it feels fluid and supported rather than springy. Dual dynamic lumbar adapts to different postures and body shapes, the upper backrest adjusts independently to dial shoulder support for tall or short users, and the 6D armrests track precisely with your arms for typing, tablet use, or controller gaming. You also get seat-depth adjustment, a soft, oversized headrest, and materials like Italian velvet + DuPont TPEE mesh that balance stretch with long-term durability. Rated to 136 kg, recommended for 150-190 cm heights, and covered by a 60-month warranty. If your chair is your office throne, this is it.
Sihoo M56-301 - essential ergonomics, sharp price
Don’t need a footrest or exotic mechanisms? The M56-301 covers the bases that matter: 9 cm adjustable headrest (height/angle), a backrest that lifts 6 cm to fit approx. 155-180 cm users, and “butterfly” lumbar you can nudge into the right spot. The W-shaped cushion follows your hip line to disperse pressure, and the chair reclines up to ~135 degrees for breaks. It’s a smart pick for home offices and study corners where comfort, not flash, is the priority.
Sihoo M102C-M101 - cushioned seat, flip-up arms, easy living
If you like a plush, wider seat and the flexibility to flip armrests up to slide under a smaller desk, the M102C-M101 is the practical choice. You still get mesh back breathability, 6 cm lumbar height adjustment, height/angle headrest, and 3D armrest movement (slide, rotate, and flip). It’s rated up to 300 lb, and the overall package suits multi-purpose spaces where the chair does double duty for work, study, and leisure.
How to choose the right Sihoo for you
If you want the most advanced ergonomic tech: go Doro S300 for its anti-gravity recline, 6D armrests, and independently adjustable upper backrest. The adjustability range and materials justify the premium if you’re at the desk 40+ hours a week.
If you want a premium feel without the top-tier price: pick Doro C100. Its weight-sensing recline and dynamic lumbar keep comfort consistent as you fidget and move, and the integrated footrest turns quick breaks into actual rest.
If you’re upgrading on a budget: consider M90B-401 for the strong mesh build, linked armrests, and higher load rating; or M56-301 if you prefer a cushioned seat and straightforward adjustments.
If you need “flip-up and tuck-away” flexibility: the M102C-M101 is purpose-built for smaller spaces and hybrid work-and-study routines.
Pro tip for fit: Aim for a chair where the lumbar pad aligns with your belt line, the seat depth lets you keep 2-3 fingers of clearance behind your knees, and the armrests meet your elbows at ~90 degrees when your shoulders are relaxed. The S300 includes a seat-depth slider to fine-tune thigh support; on others, look for a waterfall front edge and adjust backrest height/lumbar position to suit.
Ready to upgrade your sit?
Premium pick: Sihoo Doro S300 - anti-gravity recline, dual dynamic lumbar, 6D arms.
Best all-rounder: Sihoo Doro C100 - adaptive lumbar + weight-sensing comfort.
Best value with footrest: Sihoo M90B-401 - linked armrests, sturdy mesh build.
Budget essential: Sihoo M56-301 - adjustable headrest/back + butterfly lumbar.
Small-space hero: Sihoo M102C-M101 - plush seat, flip-up arms, easy to tuck under a desk.
Ergonomics isn’t one-size-fits-all. What matters most is support that meets your body and adjustments you’ll actually use. Sihoo’s new range at PB Tech leans into adaptive support across price points, so whether you’re chasing the feather-light recline of the Doro S300, the do-everything comfort of the Doro C100, or the practical value of the M-series, there’s a seat here that makes the hours feel lighter - and the work a little easier.
