As we where racing in Kemnade,
www.sup-mag.de/races_events/ergebnisse/np-german-sup-trophy-kemnade--bericht-und-ergebnisse a lake in the german Ruhr-area, all competitors had to fight weed.
Hardboardriders used seaweedfins,
www.seabreeze.com.au/forums/Stand-Up-Paddle/SUP/Help-wanted/ but there was no option for inflatables with slide-in fin boxes.
So we developed a fin we called "
Die Wand".
http://supball.de/index.php/isupi/whois 
there will soon be an english page available,
Bernd@supball.de
