My mind needs were kept relatively simple. It should:
a) can be folded small and beautiful
b) completely cover the wooden chair.
My requirement under a) is fully met. The cushion is small and can be wonderfully tuck in my trolley. When folded, it is as thick as a Lenovo laptop, so here top about!
Regarding b) holding the seat cushion my requirements unfortunately was not. I can Although it sit well without my butt touched the chair, but I would have wished that this would also be the case with my legs. However, the seat cushion is enough unfortunately of the dimensions is not sufficient to keep the lower leg of the wooden chairs away.
Who wants to use in the fall / winter for the great outdoors, the seat cushion, which unfortunately I can only advise here. It's nice thin and therefore can also be folded relatively small. In the wild, or in the stadium there will thus probably be a bit cold but after a relatively short time.
In summer it is enough hiking or a break but, in my opinion, in order to get any dirty ass.
Conclusion:
If the pillow had a few more centimeters, I could recommend it unreservedly for my use. So it was good enough in the summer to bring on a hike or a short break no dirty ass.
For me, therefore only 4 stars.