It's been about a decade since I talked to my ETL-log to pull the trigger on a new piece of line but back then they were listed as 'Nestaflex' with various features. I have no idea if they're even listed on GoCart. If they're there, just be cautious since there's several varieties between widths, lengths, fins (which I had to remove from our new piece) and motorized.
As others have said, a length of this stuff is very expensive so the request will go straight to your DSD so I wouldn't order this just on a whim