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SIHOO

SIHOO B100 Office Chair, Comfy Ergonomic Office Chair, High Back Computer Chair with Adaptive Lumbar Support & Wide Headrest, Flip-up Armrests, Swivel Desk Chair for Long Hours, Grey

Very Good

Mesh back
Headrest
300 lb capacity

$159.97~~$219.99~~

You save $60.02 off the list price

In stock on Amazon.com

Specs verified August 2026

Amazon.com data updated October 13, 2026, 2:34 pm ET. Price and availability are accurate as of the time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply.

Ergo Score Breakdown

Ergo Score: 51/100

Adjustability 10/40

Armrests1/10flip-up armrests: 1/10

Seat height4/6adjustable, 3.6 in range: 4/6

Seat depth0/5Not listed by the seller

Lumbar adjustment0/7Not listed by the seller

Recline2/2recline to 135 degrees: 2/2

Tilt lock3/3tilt lock: 3/3

Tilt tension0/3Not listed by the seller

Advanced tilt0/4Not listed by the seller

Support 20/30

Lumbar support12/12lumbar support: 12/12

Upper back support4/4headrest: 4/4

Headrest adjustment0/2Not listed by the seller

Cushion0/5Not listed by the seller

Seat edge0/3Not listed by the seller

Breathable back4/4mesh back: 4/4

Build 21/30

Warranty3/93-year warranty: 3/9

Weight capacity6/6300 lb capacity: 6/6

Certifications5/5BIFMA, SGS: 5/5

Base2/3metal base: 2/3

Gas lift2/2Class 4 gas lift: 2/2

Owner rating3/54.3 stars from 3522 reviews: 3/5

Comfort Index

Comfort Index: 53/100

Seat cushionNot listed by the seller

Cushion thicknessNot listed by the seller

Recline15/15

Breathable back15/15

Headrest10/10

Armrests0/10

Owner rating13/25

Specifications

Seat height range	18.3 to 21.9 in
Seat width	Not listed by the seller
Seat depth	Not listed by the seller
Seat depth adjustable	Not listed by the seller
Seat cushion	Not listed by the seller
Cushion thickness	Not listed by the seller
Back material	Mesh
Backrest height	Not listed by the seller
Backrest width	Not listed by the seller
Armrests	Flip-up
Lumbar support	Dynamic
Lumbar adjustments	Not listed by the seller
Headrest	Yes
Max recline	135 degrees
Tilt mechanism	Not listed by the seller
Base material	Metal
Casters	Standard
Gas lift	Class 4
Weight capacity	300 lb
Chair weight	Not listed by the seller
Overall height	Not listed by the seller
Warranty	3 years
Certifications	BIFMA, SGS

Fit Guide

A comfortable seat height is about a quarter of your body height. Here is how this chair's listed seat range lines up (how we rate).

Your height	Seat range	Fit	Weight
4'11" to 5'3"	18.3 to 21.9 in seat (ideal about 15.3 in)	Seat may be too high	Rated to 300 lb
5'4" to 5'7"	18.3 to 21.9 in seat (ideal about 16.4 in)	Seat may be too high	Rated to 300 lb
5'8" to 5'11"	18.3 to 21.9 in seat (ideal about 17.4 in)	Seat may be too high	Rated to 300 lb
6'0" to 6'3"	18.3 to 21.9 in seat (ideal about 18.4 in)	Good fit	Rated to 300 lb
6'4" and up	18.3 to 21.9 in seat (ideal about 19.3 in)	Good fit	Rated to 300 lb

Flip-up armsDynamic lumbarHeadrestMesh backTilt lock

What We Like

The build sub-score of 21 ties for second in its category, led by full credit for the BIFMA and SGS certifications and for a stated gas lift class.
Owners rate it 4.3 across 3,522 reviews, one of the larger review counts in its category.
The lumbar is listed as dynamic, which the title calls adaptive, and it earns the full lumbar-support credit.

Watch Out For

The arms are in the flip-up class, which the listing names without any height, width or depth adjustment.
Adjustability is the pillar that loses most, at a sub-score of 10: seat depth, lumbar adjustment, tilt tension and advanced tilt all score zero because the listing does not state them.

At a Glance

A 135 degree recline, a dynamic lumbar, a headrest and flip-up arms make up the stated spec of the SIHOO B100.

Who This Chair Is For

Buyers who want to fold the arms out of the way and still have a headrest to lean into.
Shoppers who want certifications named in the listing: BIFMA and SGS.

Who Should Look Elsewhere

Anyone who wants to set arm height, width or depth, since the listing names flip-up only.
Anyone who needs a rating above 300 lb, the figure the listing states.

What the SIHOO B100 lists for its headrest, arms and casters

The title calls the headrest wide; the spec fields confirm that it is present, and whether it adjusts is not stated. The arms flip up. The base is metal and the casters are described as quiet.

Alternatives to Consider

Nouhaus

Nouhaus Fluido Ergonomic Office Chair, High Back Mesh Computer Chair w/Height Adjustable Lumbar Support, Backrest & Headrest, Dynamic Back Support, 3D Armrests, Home Office Desk Chairs Comfy (Black)

Very Good

In stock on Amazon.com

$329.99Comfort Index 73/100

Why consider: Lists tilt tension adjustment and a lumbar that adjusts in height, neither of which this SIHOO states, though its capacity is 275 lb against 300 lb here.

SIHOO

SIHOO M59AS Ergonomic Office Chair, Desk Chair with 3D Flip-up Armrests, Computer Chair with Dual Back Design and Adaptive Dynamic Lumbar Support Grey

Very Good

In stock on Amazon.com

$199.99Comfort Index 71/100

Why consider: Another SIHOO design, with 3D arms and a headrest that adjusts in height and angle, where this SIHOO has flip-up arms and a headrest whose adjustments are not stated.