Quote:
Originally Posted by mgvande
They could hold critters or plant life in them
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Felts absorb water and the micro organisms that live there. It can take weeks for felts to completely dry and thus organisms from one water system, whirling disease is of particular note and its spread from system to system is a driving impetus for many jurisdictions in the US banning the use of felt soled wading boots. There is an interesting read here.
http://www.dnr.state.mn.us/invasives/felt.html