Natural fiber
Manila, hemp, jute — warm to the hand, easy to knot, and it tells you when it's failing.
Warm, grippy, honest
Manila, hemp, jute, and sisal are plant fibers. They grip knots beautifully, hold a coil, and — unlike plastic — they tell you when they're done. You can feel the wear.
Strengths
grip excellent — knots bite and hold feel warm, textured, no slick fail visibly — fuzz, then a break life shorter outdoors; rot in damp
Best for
Decorative knotting, rigging that gets inspected, anything where the feel matters more than the strength. Not for permanent outdoor load.