The fit comparison
Compare the published fit limits
These are published seat dimensions. Measure the raised arm housings and castor base for your desk opening.
Scroll across the table for every fit check.
| Model | Seat height | Seat depth | Arm clearance |
|---|---|---|---|
| SIHOO M59AS, black A fixed pan with folding arms | 46.5–56.5 cm | 43.5 cm published seat depth, fixed | Flip-up arms for parking. Check the chair in its working position too. |
| Vinsetto 921-405V70, black For a deeper seat | 48–58 cm | 47 cm published | 90° flip-up pads. Check the hinge width. |
Measure the chair with the arms in both positions
Start with your normal working position. With the chair at your preferred seat height, measure to the underside of the worktop and any drawer. Check the distance between the inside faces of the desk legs. Then measure the width and height of the chair where the arms project outwards.
Draw a side view of the desk edge and the chair hinge. During a flip, an arm pad follows an arc and may pass near the desk edge or chair back. Take a second measurement with the arms raised. Check the hinge housing, which stays on the chair when the pads fold. Ask for the widest parked measurement on the exact model if the seller does not publish it.
Test the base too. A five-star chair turns at different angles as you push it in, and a castor may catch a cupboard plinth while the seat clears the opening. See the chair clearance guide for a way to mark both the working and parked positions on the floor.
SIHOO M59AS for a shallower seat
The black M59AS has a published seat height of 46.5–56.5 cm and a fixed depth of 43.5 cm. That shallower depth gives some users more room behind the knees, depending on how far back they sit. Measure your preferred height and trial the depth before choosing.
A fixed pan with folding arms
SIHOO M59AS, black
The black M59AS has a published 43.5 cm seat depth and arms that flip up for parking under a desk.
The seat starts at 46.5 cm. Check supported feet and knee clearance at that height. A trial is especially useful if your target depth is close to 43.5 cm.
- 46.5–56.5 cm seat height
- 43.5 cm seat depth
- Flip-up arms
Start your parking check at the height you use for typing. If you have to lower the chair every time to push it in, try the full routine before ordering. In a narrow room, check whether the backrest and remaining hinge housings still project into the walkway.
Vinsetto 921-405V70 for a deeper seat
The black Vinsetto 921-405V70 has a 47 cm published seat depth, a 48–58 cm seat-height range and arm pads that flip up through 90°. The Amazon UK listing gives a 62 cm overall width. Ask for the width at the raised arm pivots if the desk opening is close to that figure.
For a deeper seat
Vinsetto 921-405V70, black
A black mesh swivel chair with 90° flip-up arm pads and a published 47 cm seat depth.
Measure the raised hinge and castor envelope separately. Trial the seat depth and support at the working height.
- 48–58 cm seat height
- 47 cm seat depth
- 90° flip-up arms
A 47 cm seat can support more of the thigh for someone who needs it. Use the seat-depth check to see whether you can sit against the backrest with room behind the knees. If the desk is shared, check both seat-height targets and both arm positions.
Decide how you will use the arms at work
Sit close enough to the desk to reach the keyboard and mouse with your shoulders relaxed. Try typing with the arms down, then up. An arm that fits under the desk may still hold your elbows too high. If you prefer to use the arms while working, check the pad height from the seat and ask whether that setting is adjustable.
Check side access as well. A folding arm can help when you enter from beside a storage unit. Leave space to grip it and follow the maker’s instructions for moving it. Keep your fingers clear of the hinge. Once you have found a working position, measure how far into the room the parked chair projects. Compare that figure with the space you need to walk past or open the door.
If the space behind you is especially tight, mark the back of the chair on the floor at the point where you can stand up easily. Use that mark to test whether flipping the arms lets you reclaim enough room. Measure the remaining walkway with the chair empty and with someone seated.
If you want to remove the arm obstruction altogether, compare armless chairs and measure the castor base.
For changes to pad height, angle or width, check what the armrest controls move.
Common questions
Do flip-up armrests fit under every desk?
The hinge, chair back and castor base still need room. Measure the chair at your working height with the arms raised and compare it with the full desk opening.
Are flip-up arms height-adjustable?
Some chairs offer more than one adjustment. Check whether the exact variant can change the arm pad height as well as folding.
Should I measure a chair with the arms up or down?
Measure both. Check the down position for working and the up position for parking. Check the path between those positions too.
Which of these two chairs has the shorter seat?
The SIHOO M59AS has a published 43.5 cm depth. The Vinsetto 921-405V70 lists 47 cm. Test how each depth feels with your back supported.
Can I leave the arms up while typing?
Try it with the keyboard and mouse close enough that your shoulders stay relaxed. Check that your feet and thighs have room in that working position.
Sources and selection
Sources and Amazon UK listings checked in November 2026. This guide uses published specifications and fitting guidance. The Vinsetto dimensions come from the brand’s Amazon UK listing for the black 921-405V70.