Swimmers typically wear two caps primarily to improve hydrodynamics and keep their hair protected and secure.
Here's a breakdown of the reasons:
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Hydrodynamics and Drag Reduction:
- The outer cap, usually silicone, is designed to create a smooth, streamlined surface. This reduces drag in the water, allowing the swimmer to move faster. Silicone caps are less prone to wrinkling compared to latex.
- The smooth surface minimizes turbulence and resistance, crucial for competitive swimming.
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Hair Protection and Security:
- The inner cap, often latex, helps to grip the hair more effectively. Latex provides better friction and prevents the cap from slipping off during vigorous swimming.
- The combined layers offer better protection against chlorine and other pool chemicals, minimizing hair damage.
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Layering Benefits:
- Secure Fit: The first cap grips the hair, while the second smooths out any bumps and creates a more streamlined profile.
- Reduced Wrinkling: Latex clings well but can wrinkle. The silicone cap, being smoother, minimizes these wrinkles, further reducing drag.
- Durability: If one cap tears, the second provides a backup, ensuring that the swimmer's hair remains protected and the aerodynamic advantage is maintained.
In essence, the combination of latex and silicone caps provides a balance between grip, comfort, and hydrodynamic efficiency. The latex cap secures the hair, while the silicone cap smooths the surface for reduced drag.
