Which property of synthetic fiber ropes allows them to absorb very little moisture?

The property of synthetic fiber ropes that allows them to absorb very little moisture is indeed related to their material composition. Synthetic fibers, such as nylon, polyester, or polypropylene, are designed to have hydrophobic properties, which means they repel water rather than absorb it. This characteristic is inherent in the way the fibers are produced and treated during manufacturing.

The material composition is critical in determining the performance characteristics of the rope. For instance, polypropylene is particularly known for its buoyancy and resistance to moisture, making it ideal for applications where the rope may come into contact with water. This low moisture absorption helps synthetic fiber ropes maintain their strength and performance, especially in environments that are wet or humid.

While other options like low density and resistance to mildew can play significant roles in the performance and durability of ropes, they do not directly explain why synthetic fiber ropes absorb very little moisture. High weight to strength ratio refers to the strength of the material relative to its weight but does not address moisture absorption directly. Resistance to mildew is a related benefit but pertains more to the deterioration of the material over time rather than its moisture absorption characteristics. Therefore, the material composition is the most accurate explanation for the low moisture absorption of synthetic fiber ropes.