There are four different density options  to cover all Jungle conditions:
F - A full FLOATING line
F/I - A floating line with a 30ft INTERMEDIATE head, the first 10ft of which is clear
F/S3 - A floating line with a 20ft SLOW SINKING (3 ips) tip
F/S6 - A floating line with a 20ft FAST SINKING (6 ips) tip