Which of the following equipment is not useful if we went to cross a river in the mountains?

Sometimes while going up higher altitudes, mountaineers need to cross small rivers. Crossing those rivers requires various things. The first requirement is a thick rope that is fixed with another important tool, called pegs or pitons, from one bank of the river to another. Then a rope has to be tied to the waist and a sling (meaning a type of hook) is put in it. This sling is then attached to the thick rope across the river so that if someone loses their balance they won't be carried away by the river. The only thing that is not necessary is cloth. So the correct option is 4.