Seat adequate, but squeaky material

The air cushion has a sufficiently large seat.
On one side are small rounded knobs on which you can sit well.
The bottom has higher nubs VLT promote blood circulation and are also very pleasant in between, but in the long run then but a bit uncomfortable while sitting.
For the back cushion is a welcome change, but without additional back exercises is also not a permanent solution for the hours of office work.

Why now only two stars .... the material is not very useful.
If you sit on it and only a little slips back and forth, makes the pillow funny noises and the Colleague thinks you farting around all day. This is exactly why I use the pillow very rarely.

It is a ball of the hand was even the case. This is very strong and it is difficult to zusammengeknautscht.
Reminds me more of a dog plaything. Unfortunately, there is not really my thing.