What are buoys made of?

Buoys are typically made from durable materials such as high-density polyethylene (HDPE), fiberglass, or metal, designed to withstand harsh marine environments. Many buoys are also foam-filled for added buoyancy and stability. The choice of material often depends on the buoy's intended use, whether for navigation, marking hazards, or supporting fishing activities. Additionally, bright colors and reflective coatings are often used to enhance visibility.