SIHOO Chair Models Compared: M56C, B100, B100 Pro, M18, M57, B300 Pro, M59AS, Doro C300, C300 Pro, C300 Pro V2, C300 Ultra V2, S100 and S300

SIHOO sells several ergonomic mesh chairs that look alike in photos but differ in armrests, lumbar design, seat-depth adjustment and price. This page lines up the SIHOO models we cover so you can see the differences at a glance before opening a model page.

Prices are the regular list prices on the SIHOO US official store (the store usually also shows a lower sale price). Specifications come only from SIHOO's own US, UK and EU stores; a blank cell means SIHOO does not publish that figure.

Prices and specifications checked Oct 13, 2026.

SIHOO models side by side

SIHOO M56C

$184.99

Black $184.99; the store shows no separate sale price (Pre-order button shown on 2026-10-13)

The lowest list price here: a dual-section mesh back with a lumbar panel that moves with it (no manual setting), a headrest that moves up/down and tilts, and height-only arms; rated to 300 lb, and SIHOO publishes no seat-height range.

Seat height: Not published
Seat depth: 17 in · 43 cm
Seat width: 20 in · 51 cm
Load capacity: 300 lb · 136 kg
Recline: Maximum tilt angle of 125° (reclining lock with 1 position)
Armrests: Armrests adjustable up and down
Lumbar: Ultra-wide dynamic lumbar support
Warranty: 3 years

SIHOO B100

$199.99 – $259.99

Cushioned Seat Standard Version $199.99, Mesh Seat Standard Version $219.99, Mesh Seat Footrest Version $259.99 (Black and White); the store shows no separate sale price

Flip-up 2D arms, a floating sacral cushion, a 2D headrest and three recline positions up to 135°; SIHOO publishes no seat depth.

Seat height: 18.3–22 in · 46–56 cm
Seat depth: Not published
Seat width: Not published
Load capacity: 330 lb · 150 kg
Recline: Three lockable angles: 110°, 125° and 135°
Armrests: Flip-up 2D armrests
Lumbar: Floating sacral cushion
Warranty: 3 years

SIHOO B100 Pro

$259.99 – $299.99

Standard Version $259.99, Footrest Version $299.99 (Black and White); the store shows no separate sale price (Standard Version shown as sold out on 2026-10-09)

The same listed overall size as the B100, with 4D flip-up arms, a wide 3D headrest and a responsive lower-back support; SIHOO publishes no seat depth or seat width.

Seat height: Not published
Seat depth: Not published
Seat width: Not published
Load capacity: 330 lb · 150 kg
Recline: 3-position recline up to 135°
Armrests: Enlarged 4D flip-up armrests
Lumbar: Responsive lower-back support
Warranty: 3 years

SIHOO M18

$289.99 – $299.99

Black (incl. Skate Wheels) $289.99; White/Blue/Green/Pink $299.99

Height-adjustable arms, a lumbar pad that moves up/down and in/out, and a headrest that moves up/down and pivots.

Seat height: 17.3–21.3 in · 44–54 cm
Seat depth: 18 in · 45 cm
Seat width: Not published
Load capacity: 330 lb · 150 kg
Recline: Up to 126°
Armrests: Adjustable armrests
Lumbar: Lumbar support adjusts vertically and horizontally
Warranty: 3 years

SIHOO M57

$319.99

Black, Gray and White $319.99 (list = the store's compare-at price; on 2026-10-09 the store showed $239.99)

All-mesh seat and back, 3D arms, a lumbar pad that moves up/down and in/out, and a headrest that rises 3.9 in and tilts 45°.

Seat height: 18–21.7 in · 46–55 cm
Seat depth: 18 in · 46 cm
Seat width: 20 in · 51 cm
Load capacity: 330 lb · 150 kg
Recline: Reclines up to 126°
Armrests: 3D coordinated armrests
Lumbar: Dual-adjustable lumbar support
Warranty: 3 years

SIHOO B300 Pro

$329.99 – $379.99

Standard Version (Black $329.99, White $339.99) and Footrest Version (Black $369.99, White $379.99) (list = the store's compare-at price; on 2026-10-09 the store showed $259.99-$299.99)

4D lumbar (0.8 in depth, 2 in height), 6D flip-up arms, a 2.2 in height-adjustable backrest and about 2 in of seat-depth travel; SIHOO publishes no seat height.

Seat height: 18.5–21.8 in · 47–55 cm
Seat depth: 16.5–18.5 in · 42–47 cm
Seat width: 19 in · 49 cm
Load capacity: 330 lb · 150 kg
Recline: Three lockable recline angles: 105°, 120°, 135°
Armrests: 6D All-Around Armrests
Lumbar: 4D MicroFit Lumbar Support
Warranty: 3-Year Free Warranty

SIHOO M59AS

$449.99

Black and White $449.99 (list = the store's compare-at price; on 2026-10-09 the store showed $239.99)

A two-part backrest with a dynamic lumbar section, 3D flip-up arms and a double-jointed headrest, with a 46.5-56.5 cm seat-height range.

Seat height: 18.3–22.2 in · 47–57 cm
Seat depth: 17 in · 44 cm
Seat width: 20 in · 51 cm
Load capacity: 330 lb · 150 kg
Recline: Recline up to 126°
Armrests: 3D coordinated flip-up armrests
Lumbar: Dynamic lumbar support in a dual-section backrest
Warranty: 3 years

SIHOO Doro S100

$499.99 – $509.99

Black $499.99, White $509.99 (both shown as sold out on 2026-10-08)

Dual lumbar pads, an integrated adjustable headrest, 4D arms and a seat-depth adjustment, at about half the S300's list price.

Seat height: 18–21.3 in · 46–54 cm
Seat depth: 15.2–17 in · 38–43 cm
Seat width: 20 in · 51 cm
Load capacity: 330 lb · 150 kg
Recline: Reclines up to 135°
Armrests: 4D coordinated armrests
Lumbar: Dual dynamic lumbar support
Warranty: 3 years

SIHOO Doro C300 Pro V2

$499.99 – $549.99

Standard Version (Black $499.99, White $509.99) and Footrest Version (Black $539.99, White $549.99)

People who want to set the lumbar themselves (3 levels), 8D arms and a height-adjustable backrest; SIHOO publishes no seat height.

Seat height: 17.5–21 in · 44–53 cm
Seat depth: 17–18.5 in · 43–47 cm
Seat width: 20.5 in · 52 cm
Load capacity: 330 lb · 150 kg
Recline: 105°, 120°, 135°
Armrests: 8D Bionic Armrests
Lumbar: Domino™ Sacral-Lumbar Support 2.0
Warranty: 3 years

SIHOO Doro C300

$559.99 – $569.99

Standard Version (Black $559.99, White $569.99); Footrest Version $609.99-$619.99 excluded

The original Doro: a self-adaptive lumbar pad, 4D arms and a 3D headrest.

Seat height: 18.5–21.7 in · 47–55 cm
Seat depth: 17–18 in · 44–46 cm
Seat width: 19.5 in · 50 cm
Load capacity: 330 lb · 150 kg
Recline: 110°, 120°, 130°
Armrests: 4D coordinated armrests
Lumbar: Self-adaptive dynamic lumbar support
Warranty: 3 years

SIHOO Doro C300 Ultra V2

$679.99 – $689.99

Footrest Version (Black $679.99, White $689.99; the only version on the US store) (list = the store's compare-at price; on 2026-10-13 the store showed $609.99-$619.99)

The top C300 model, sold with a footrest on the US store: 8D arms, a lumbar support that moves up or down with 3 levels, a 16.9-18.5 in seat depth and recline locks at 105°, 120° and 135°.

Seat height: 18.7–22 in · 48–56 cm
Seat depth: 17–18.5 in · 43–47 cm
Seat width: 20.5 in · 52 cm
Load capacity: 330 lb · 150 kg
Recline: 105°, 120°, 135°
Armrests: 8D Bionic Armrests
Lumbar: Domino™ Sacral-Lumbar Support 2.0
Warranty: 3 years

SIHOO Doro C300 Pro

$789.99 – $839.99

Standard Version (Black $789.99, White $799.99) and Footrest Version (Black $829.99, White $839.99)

The C300 design with an adjustable seat depth and 6D arms.

Seat height: 18–22.3 in · 46–57 cm
Seat depth: 16.8–17.8 in · 43–45 cm
Seat width: 20.3 in · 52 cm
Load capacity: 330 lb · 150 kg
Recline: Up to 135°
Armrests: 6D coordinated armrests
Lumbar: Lumbar support automatically conforms to your spine
Warranty: 3 years

SIHOO Doro S300

$999.99

Black and White

The highest list price here: dual lumbar pads, an integrated adjustable headrest and 6D arms.

Seat height: 18.5–22 in · 47–56 cm
Seat depth: 15.7–18.5 in · 40–47 cm
Seat width: 20.3 in · 52 cm
Load capacity: 330 lb · 150 kg
Recline: 100°, 110°, 130°
Armrests: 6D coordinated armrests
Lumbar: Dual dynamic lumbar support
Warranty: 3 years

SIHOO models: official list price and specifications
Model	US list price	Seat height	Seat depth	Seat width	Load capacity	Recline	Armrests	Lumbar	Warranty
SIHOO M56C The lowest list price here: a dual-section mesh back with a lumbar panel that moves with it (no manual setting), a headrest that moves up/down and tilts, and height-only arms; rated to 300 lb, and SIHOO publishes no seat-height range.	$184.99	Not published	17 in · 43 cm	20 in · 51 cm	300 lb · 136 kg	Maximum tilt angle of 125° (reclining lock with 1 position)	Armrests adjustable up and down	Ultra-wide dynamic lumbar support	3 years
SIHOO B100 Flip-up 2D arms, a floating sacral cushion, a 2D headrest and three recline positions up to 135°; SIHOO publishes no seat depth.	$199.99 – $259.99	18.3–22 in · 46–56 cm	Not published	Not published	330 lb · 150 kg	Three lockable angles: 110°, 125° and 135°	Flip-up 2D armrests	Floating sacral cushion	3 years
SIHOO B100 Pro The same listed overall size as the B100, with 4D flip-up arms, a wide 3D headrest and a responsive lower-back support; SIHOO publishes no seat depth or seat width.	$259.99 – $299.99	Not published	Not published	Not published	330 lb · 150 kg	3-position recline up to 135°	Enlarged 4D flip-up armrests	Responsive lower-back support	3 years
SIHOO M18 Height-adjustable arms, a lumbar pad that moves up/down and in/out, and a headrest that moves up/down and pivots.	$289.99 – $299.99	17.3–21.3 in · 44–54 cm	18 in · 45 cm	Not published	330 lb · 150 kg	Up to 126°	Adjustable armrests	Lumbar support adjusts vertically and horizontally	3 years
SIHOO M57 All-mesh seat and back, 3D arms, a lumbar pad that moves up/down and in/out, and a headrest that rises 3.9 in and tilts 45°.	$319.99	18–21.7 in · 46–55 cm	18 in · 46 cm	20 in · 51 cm	330 lb · 150 kg	Reclines up to 126°	3D coordinated armrests	Dual-adjustable lumbar support	3 years
SIHOO B300 Pro 4D lumbar (0.8 in depth, 2 in height), 6D flip-up arms, a 2.2 in height-adjustable backrest and about 2 in of seat-depth travel; SIHOO publishes no seat height.	$329.99 – $379.99	18.5–21.8 in · 47–55 cm	16.5–18.5 in · 42–47 cm	19 in · 49 cm	330 lb · 150 kg	Three lockable recline angles: 105°, 120°, 135°	6D All-Around Armrests	4D MicroFit Lumbar Support	3-Year Free Warranty
SIHOO M59AS A two-part backrest with a dynamic lumbar section, 3D flip-up arms and a double-jointed headrest, with a 46.5-56.5 cm seat-height range.	$449.99	18.3–22.2 in · 47–57 cm	17 in · 44 cm	20 in · 51 cm	330 lb · 150 kg	Recline up to 126°	3D coordinated flip-up armrests	Dynamic lumbar support in a dual-section backrest	3 years
SIHOO Doro S100 Dual lumbar pads, an integrated adjustable headrest, 4D arms and a seat-depth adjustment, at about half the S300's list price.	$499.99 – $509.99	18–21.3 in · 46–54 cm	15.2–17 in · 38–43 cm	20 in · 51 cm	330 lb · 150 kg	Reclines up to 135°	4D coordinated armrests	Dual dynamic lumbar support	3 years
SIHOO Doro C300 Pro V2 People who want to set the lumbar themselves (3 levels), 8D arms and a height-adjustable backrest; SIHOO publishes no seat height.	$499.99 – $549.99	17.5–21 in · 44–53 cm	17–18.5 in · 43–47 cm	20.5 in · 52 cm	330 lb · 150 kg	105°, 120°, 135°	8D Bionic Armrests	Domino™ Sacral-Lumbar Support 2.0	3 years
SIHOO Doro C300 The original Doro: a self-adaptive lumbar pad, 4D arms and a 3D headrest.	$559.99 – $569.99	18.5–21.7 in · 47–55 cm	17–18 in · 44–46 cm	19.5 in · 50 cm	330 lb · 150 kg	110°, 120°, 130°	4D coordinated armrests	Self-adaptive dynamic lumbar support	3 years
SIHOO Doro C300 Ultra V2 The top C300 model, sold with a footrest on the US store: 8D arms, a lumbar support that moves up or down with 3 levels, a 16.9-18.5 in seat depth and recline locks at 105°, 120° and 135°.	$679.99 – $689.99	18.7–22 in · 48–56 cm	17–18.5 in · 43–47 cm	20.5 in · 52 cm	330 lb · 150 kg	105°, 120°, 135°	8D Bionic Armrests	Domino™ Sacral-Lumbar Support 2.0	3 years
SIHOO Doro C300 Pro The C300 design with an adjustable seat depth and 6D arms.	$789.99 – $839.99	18–22.3 in · 46–57 cm	16.8–17.8 in · 43–45 cm	20.3 in · 52 cm	330 lb · 150 kg	Up to 135°	6D coordinated armrests	Lumbar support automatically conforms to your spine	3 years
SIHOO Doro S300 The highest list price here: dual lumbar pads, an integrated adjustable headrest and 6D arms.	$999.99	18.5–22 in · 47–56 cm	15.7–18.5 in · 40–47 cm	20.3 in · 52 cm	330 lb · 150 kg	100°, 110°, 130°	6D coordinated armrests	Dual dynamic lumbar support	3 years

Twelve of the thirteen models list a 330 lb maximum load on the SIHOO US store; the M56C's US page lists 300 lb in its feature list and FAQ (and 330 lb in its spec list), and we show 300 lb. SIHOO's UK and EU stores list lower figures for several of them (for example 136 kg / 300 lb for the Doro C300, C300 Pro, S300 and M59AS, 120 kg for the B300 Pro, and 300 lb for the S100 on the UK store); we show the US figure.
The C300 Pro V2 has a lower regular price than the C300 Pro, although it is the newer model.
Seat height is not published for the M18, the M56C, the C300 Pro V2 and the B300 Pro, and seat depth and seat width are not published for the B100 and B100 Pro.
The M57 and M59AS list prices are the US store's compare-at prices; both were on sale for $239.99 when we checked.

SIHOO comparisons

Sources

SIHOO M56C: SIHOO US Official Store (price, checked Oct 13, 2026) · specifications · Image: SIHOO
SIHOO B100: SIHOO US Official Store (price, checked Oct 8, 2026) · specifications · Image: SIHOO
SIHOO B100 Pro: SIHOO US Official Store (price, checked Oct 9, 2026) · specifications · Image: SIHOO
SIHOO M18: SIHOO US Official Store (price, checked Oct 7, 2026) · specifications · Image: SIHOO
SIHOO M57: SIHOO US Official Store (price, checked Oct 9, 2026) · specifications · Image: SIHOO
SIHOO B300 Pro: SIHOO US Official Store (price, checked Oct 9, 2026) · specifications · Image: SIHOO
SIHOO M59AS: SIHOO US Official Store (price, checked Oct 9, 2026) · specifications · Image: SIHOO
SIHOO Doro S100: SIHOO US Official Store (price, checked Oct 8, 2026) · specifications · Image: SIHOO
SIHOO Doro C300 Pro V2: SIHOO US Official Store (price, checked Oct 8, 2026) · specifications · Image: SIHOO
SIHOO Doro C300: SIHOO US Official Store (price, checked Oct 7, 2026) · specifications · Image: SIHOO
SIHOO Doro C300 Ultra V2: SIHOO US Official Store (price, checked Oct 13, 2026) · specifications · Image: SIHOO
SIHOO Doro C300 Pro: SIHOO US Official Store (price, checked Oct 8, 2026) · specifications · Image: SIHOO
SIHOO Doro S300: SIHOO US Official Store (price, checked Oct 7, 2026) · specifications · Image: SIHOO