The filter is made by these guys,
http://www.uniflow.com.au/they have quite a bit of off road experience & are well known in Australia.
The filter is more for off road very dusty conditions & would not expect high air flows like the DNA filters. One could carry a few of these foam filters in your tool kit, they can be folded up into small spaces & could be change when travelling in very dust conditions at anytime, then wash & re-oiled ready them for your next next run the following day.
One thing they are much cheaper buying the filter directly from them around 40 Euro
http://www.uniflow.com.au/contents/en-us/d323.html