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005 - Yellow - Brown
Saint Laurent SL 641 Sunglasses
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Saint Laurent SL 641 Sunglasses

001 - Black - Black

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005 - Yellow - Brown 005 - Yellow - Brown 005 - Yellow - Brown 005 - Yellow - Brown 002 - Havana - Grey 002 - Havana - Grey 002 - Havana - Grey 001 - Black - Black 001 - Black - Black 001 - Black - Black
005 - Yellow - Brown
005 - Yellow - Brown
005 - Yellow - Brown
005 - Yellow - Brown
002 - Havana - Grey
002 - Havana - Grey
002 - Havana - Grey
001 - Black - Black
001 - Black - Black
001 - Black - Black
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$215.00

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001 - Black - Black

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DESCRIPTION RATINGS & REVIEWS PRESCRIPTION GUIDE

The Saint Laurent SL 641 Sunglasses blend vintage inspiration with contemporary design, drawing from the rounded volumes of Monsieur Saint Laurent's own eyewear. This women's square cat-eye frame features bold, distinctive lines and a translucent bio-injection construction that feels both modern and refined.

The 52mm lens width provides generous coverage without overwhelming smaller faces, while the 20mm bridge sits comfortably on the nose. Each frame showcases the colored Saint Laurent logo on both temples—a subtle signature detail that distinguishes these from generic acetate frames. The bio nylon lenses offer 100% UV protection and come in gradient finishes that transition beautifully from darker tones at the top to lighter shades below.

Available in three versatile colors: classic Black with black lenses, Havana tortoise with grey gradient lenses, and a distinctive translucent Yellow with brown gradient lenses. The full-rim design (52-20-145) ensures durability and works well for prescription lens installation, making these sunglasses as functional as they are fashionable. The bio-injection material is lighter than traditional acetate while maintaining structural integrity—a detail that matters during all-day wear.

The SL 641 suits oval and triangle face shapes particularly well, with the squared cat-eye silhouette adding definition to softer features. At 145mm, the temples provide a secure fit without pinching. The 1970s cat-eye geometry paired with modern bio-injection materials gives you everyday versatility and statement-making style in one frame.

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Andrew Dellicicchi

Saint Laurent SL 641 Sunglasses

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Frequently Asked Questions

Are the Saint Laurent SL 641 sunglasses prescription-ready?

Yes, the SL 641 sunglasses are fully compatible with prescription lenses. The full-rim bio-injection frame construction supports single vision, bifocal, and progressive lenses. The 52mm lens width and 43mm lens height provide ample space for most prescription ranges.

What face shapes work best with the SL 641 frame?

The SL 641's square cat-eye shape is recommended for oval and triangle face shapes. The bold, angular silhouette adds definition to softer features, while the 52mm lens width suits small to medium faces. The 20mm bridge provides a comfortable fit for most nose widths.

What is bio-injection frame material?

Bio-injection refers to a sustainable acetate alternative made from plant-based materials. It's lighter than traditional acetate, hypoallergenic, and maintains durability. The SL 641's bio-injection construction offers the same premium look and feel as conventional acetate with reduced environmental impact.

Do the SL 641 sunglasses offer UV protection?

Yes, all Saint Laurent SL 641 sunglasses provide 100% UVA and UVB protection. The bio nylon lenses are rated Category 3, suitable for general outdoor use and high protection against sun glare, though not recommended for driving at twilight or night.

What's included with the Saint Laurent SL 641 sunglasses?

Each pair comes with authentic Saint Laurent packaging, including a protective case and cleaning cloth. All SL 641 sunglasses sold through authorized retailers include brand certification and are covered by a manufacturer's warranty.

How do the SL 641 sunglasses fit compared to other Saint Laurent models?

The SL 641 features a 52-20-145 size, which is a medium fit. The 20mm bridge provides excellent stability without slipping, and the 145mm temples offer a secure fit. Customers note the frame provides generous eye coverage while remaining comfortable for extended wear.

Compare With Similar Frames

How the Saint Laurent SL 641 Sunglasses stacks up against the closest alternatives we carry.

This product
Saint Laurent SL 641 Sunglasses
Saint Laurent Saint Laurent SL 641 Sunglasses $211.69
002 - Black - Grey
Saint Laurent Saint Laurent Monogram SL M3 Sunglasses $302.34
  • Features prominent YSL monogram hardware on temples for bolder branding
  • Similar cat-eye silhouette with luxury acetate construction
  • Comparable price range and prescription compatibility
View frame →
001 - Black - Grey
Saint Laurent Saint Laurent Classic SL 174 Sunglasses $181.41
  • Lower price point at $181.41-$181.77, offering better value
  • Classic square shape without cat-eye elements for versatile styling
  • Part of Saint Laurent's established Classic collection
View frame →
Read the full comparison

Saint Laurent SL 641 vs Similar Styles

SL 641 vs Saint Laurent Monogram SL M3

Both frames occupy the square cat-eye category, but they take different approaches to Saint Laurent branding. The SL 641 features a colored logo on the temples—a refined detail that nods to heritage without dominating the design. The Monogram SL M3, by contrast, showcases prominent YSL hardware that makes a bolder statement.

If you prefer vintage-inspired design with subtle branding, the SL 641 is the better choice at $211-215. The M3 suits those who want unmistakable luxury signaling and don't mind paying $302.34 for more prominent monogram detailing. Both are prescription-ready and offer similar fit profiles.

SL 641 vs Saint Laurent Classic SL 174

The SL 174 offers a more traditional square frame without the cat-eye lift of the SL 641. At $181.41-$181.77, it's the most affordable option in this comparison, making it ideal for budget-conscious shoppers who still want authentic Saint Laurent quality.

However, the SL 641's distinctive lines and vintage inspiration give it more character. The bio-injection construction is also more sustainable than conventional acetate. Choose the SL 174 if you want classic versatility; choose the SL 641 if you want a frame with a story and more contemporary materials.

Our recommendation: The SL 641 strikes the best balance between heritage design, modern materials, and price. Its vintage inspiration sets it apart from generic square frames, while the $211-215 price point makes Italian luxury accessible without compromising on Saint Laurent's signature quality.

At a Glance

Saint Laurent Monogram SL M3 Sunglasses

Pros:

  • Features prominent YSL monogram hardware on temples for bolder branding
  • Similar cat-eye silhouette with luxury acetate construction
  • Comparable price range and prescription compatibility

Cons:

  • More prominent branding may not suit those seeking understated style
  • Higher price point at $302.34 vs SL 641's $211-215 range
  • Less vintage-inspired, more contemporary aesthetic

Saint Laurent Classic SL 174 Sunglasses

Pros:

  • Lower price point at $181.41-$181.77, offering better value
  • Classic square shape without cat-eye elements for versatile styling
  • Part of Saint Laurent's established Classic collection

Cons:

  • Less distinctive design compared to SL 641's vintage-inspired silhouette
  • May lack the bold volumes and modern edge of the SL 641
  • Different aesthetic that doesn't reference Monsieur Saint Laurent's personal style

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