You are right rod Red Ice is a nylon hence the memory first off the spool put soon straightens out. Other models of line have copolymer characteristics the F1 is very good and up about 3lbs in breaking strain compared to others ie; F1 18lb is .35 dia and 25lb is .40 so great for the mixed ground or rough stuff. The distance line is softer and suited to clean sand beaches and a good bright yellow colour. the web site www.ultima.co.uk has lots of tech stuff and they produce a very good catalogue. Shock leader in different styles is also available.