Ray-Ban Sunglasses Khal Bio-Based - Havana Frame Green Lenses 51-20

'Khal Bio-Based' indicates that the sunglasses are part of a Ray-Ban collection that utilizes bio-based materials derived from natural, renewable sources, offering a more sustainable alternative to conventional plastics.

Yes, Ray-Ban sunglasses generally offer full UV protection, which is essential for eye health. The green lenses provide good clarity and contrast.

The 51mm refers to the lens width, and 20mm refers to the bridge width. This is a common medium size. For a precise fit, compare these measurements to sunglasses you already own that fit well, or consult an optician.

Replacement lenses can often be fitted by an authorized Ray-Ban dealer or an optician. It is recommended to use genuine Ray-Ban replacement lenses for optimal performance and fit.

Ray-Ban typically offers a limited warranty against manufacturing defects. Please refer to the warranty card included with your purchase or the official Ray-Ban website for specific terms and duration.

Clean the bio-based frame gently with a soft, damp cloth. Avoid harsh chemicals or abrasive cleaners as they can damage the material. Always dry with a soft, lint-free cloth.

Minor adjustments can be made by a professional optician. Avoid attempting to bend the frame significantly yourself, especially the bio-based material.

Clean gently with a microfiber cloth. For tougher smudges, use a lens cleaning solution specifically designed for eyewear and wipe with a clean microfiber cloth.

This may be due to prolonged exposure to high heat. Store in a cool place. If the warping is significant, consult an optician.