Amnesia means "no memory". This round monofilament looses its memory with a slight stretch and then lays coil free for the rest of the day. For this reason it is very popular as "strike-indicator" leader butt sections. Amnesia may be the ultimate shooting lines behind shooting head fly lines. It comes in either fluorescent red or fluorescent chartreuse color for maximum visibility.
This line/leaders is very popular as "sighter" in Euro nymph leaders. Amnesia is no longer being made and is becoming somewhat rare.