What type of lines are primarily recommended for use in wet conditions due to their resistance to mildew?

Synthetic lines are primarily recommended for use in wet conditions due to their resistance to mildew. These lines are made from materials such as nylon, polypropylene, or polyester, which do not absorb water in the same way that natural fibers do. As a result, they are less likely to develop mildew and rot when exposed to damp environments. This makes synthetic lines an ideal choice for marine applications where moisture is inevitable, ensuring their durability and reliability over time. Their lightweight and strong properties further enhance their usability in various weather conditions, making them the preferred option for boatswain's mates and other maritime professionals.