The entire process of building SL4000 can be completed in 15-30 minutes. The instructions manual is helpful in the building of this chair but largely uses pictorial explanations for the series of procedures and steps.

Most of the parts connect easily but there are a few areas which can be cumbersome. Attaching the seat to the backrest is tricky because the screw holes at the sides are obscured somewhat behind part of the cushioning – attempting to line up the parts, screws and balance the entire chair is tough, even with the help of an additional person.


Once everything is securely attached the overall look of SL4000 is impressive. The chair looks stylish, decent quality and comfortable. There are a selection of different colours available but our “Carbon” edition will likely coordinate with a wider selection of themes inside the office.


The arm rests on SL4000 can be moved forwards and backwards, closer or further away from your body and turned inwards or outwards to suit a specific style. Though they do appear to be hard plastic, the tops of the arm rests are soft and comfortable. One of our only gripes with SL4000 is the looseness of the armrest units themselves – they do wobble around considerably!

We’ve been testing SL4000 for a total of three weeks now and it’s surpassed our expectations for quality and comfort. Prolonged periods of usage are often the downfall for an office chair but Vertagear’s offering provides comfort for many hours due to the shape, size and materials which are utilised.


On the right-side of SL4000 there is a lever immediately next to the cushion which can adjust the angle of the backrest and beneath resides the gaslift mechanism – this device allows the chair to remain in a locked position or allow the backrest to swing. The height can also be adjusted to suit the user’s needs.