Ray-Ban Sunglasses Khal Bio-based - Black Frame Grey Lenses Polarized 51-20

Bio-based means the materials used to construct the frame are derived from renewable biological sources, making them a more sustainable alternative to traditional plastics.

The product information indicates a Nylon frame, which is a type of plastic. The lenses are typically made of polycarbonate or a similar impact-resistant material for sunglasses.

The 51mm refers to the lens width and the 20mm refers to the bridge width. For best fit, compare these measurements to sunglasses that already fit you well, or consult a size guide online.

Yes, the polarized lenses and durable frame make them suitable for many outdoor activities. However, for high-impact sports, consider specialized sports eyewear.

Rinse with lukewarm water first to remove debris, then gently wipe dry with a clean microfiber cloth. Avoid using harsh chemicals or abrasive materials.

Ray-Ban typically offers a limited warranty against manufacturing defects. Please refer to the warranty information provided with your purchase or on the official Ray-Ban website for specific details.

Yes, all Ray-Ban sunglasses provide 100% UV protection. The polarized lenses further enhance visual comfort by reducing glare.

Ensure you are using a clean microfiber cloth and a lens-appropriate cleaning solution or just water. Rinse the lenses thoroughly before wiping.

Minor adjustments can sometimes be made by gently bending the temples. For significant fit issues, consider professional adjustment at an optical store or consult the retailer.

This is a common characteristic of polarized lenses. Try tilting your head slightly to find an angle where the screen is visible, or remove the sunglasses when using such devices.

This may indicate improper storage or exposure to harsh chemicals. Ensure the sunglasses are stored in their case and cleaned only with recommended methods. If degradation is significant, contact the retailer.