Double braided nylon is constructed using only synthetic line, but because of its unique properties I included it here. Double braid, as it is called for short, is two hollow-braided ropes, one inside of the other with a braided core compressed and held in place by a tightly braided cover. This unique construction provides superior strength, 50% of which comes from the core.
Pros of double braided nylon line: Its extreme strength and elasticity make it ideal for load bearing applications, it is also very resistant to rot, mildew, and deterioration, very resistant to harmful sunlight UV rays and weathering, and it resistant to abrasion.
Cons of double braided nylon line: because it stretches, snap back is a dangerous possibility, and because it is a synthetic line, it slips easier than natural fiber line and doesn't hold knots as well.
