Choosing material

Rope is a linear collection of small units which are twisted or braided together in order to combine them into a larger and stronger form.
  -Twisted rope is made from tree or more strands.
  -Braided rope is more strong and complex than twisted rope.
We can make more strong and more thick rope with combining different ropes.
Rope is used in construction, seafering, sports, and many other areas.
Hammock is comfortable because of rope flexibility.