The applicability of ropes in marine situations may be investigated by attempting to match the conditions of use with the properties of fibres. Five commonly used fibres (nylon, polyester, polypropylene, Kevlar and Spectra) are examined in this paper. Properties important enough to be taken into account are strength (dry and wet), weight, elongation, abrasion resistance, sunlight degradation, exposure to sea‐water components and cost. It is clear that all five fibre types have advantages and drawbacks, and that the one with the optimum ratio of performance at minimum cost is nylon. Under specific conditions of use, however, each of them may be preferred, and the recommended approach is to examine the conditions under which a rope will be used. By comparing these conditions with the specific properties of each fibre type, it is possible to decide the one that best fits the intended end‐use. The possibility of choosing blends to provide an enhanced performance is also available.