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The Ray-Ban RB4378 sunglasses bring a fresh, modern edge to Ray-Ban's cat-eye heritage. This contemporary square frame reimagines classic feminine silhouettes with cleaner lines and a more minimal profile. It's a lighter alternative to the RB4376, designed for women who want versatile style without the weight.
Lightweight Nylon Construction
Built from injected nylon, the RB4378 delivers all-day comfort at a fraction of the weight of acetate classics like the Wayfarer. The full-rim square frame measures 54mm across the lens, 16mm at the bridge, and 145mm along the temples, offering balanced coverage and a secure fit. Available in transparent grey, clear, black, Havana tortoise, and gradient finishes. Polarized lenses are available in select variants, cutting glare for driving and water sports.
Prescription-Ready & UV Protection
The RB4378 is fully prescription-ready, compatible with single vision, bifocal, and progressive lenses. All lenses provide 100% UVA and UVB protection, shielding your eyes from harmful rays while maintaining optical clarity. The high bridge fit ensures comfort for a wide range of face shapes—particularly flattering on oval, round, square, and heart-shaped faces.
This frame suits women seeking everyday sunglasses that transition effortlessly from the beach to the city. The RB4378 delivers Ray-Ban's signature quality in a refreshingly lightweight package that won't weigh you down during long wear.
Product Details
Product DetailsModel
0RB4378Shape
Gender
Material
Bridge Type
Rim Type
Age Group
Color Details
Color DetailsColor Code
65722VColor Description
Transparent GreyLens Color
Dark Blue Polar
Color Code
647711Color Description
TransparentLens Color
Grey Gradient
Frame Color
BlackColor Code
601/8GColor Description
BlackLens Color
Grey Gradient
Frame Color
BrownColor Code
66025QColor Description
Transparent BrownLens Color
Purple Polar
Frame Color
TortoiseColor Code
710/13Color Description
HavanaLens Color
Gradient Brown
Frame Color
BlackColor Code
601/71Color Description
BlackLens Color
Dark Green
Frame Color
TortoiseColor Code
710/80Color Description
HavanaLens Color
Dark Blue
Color Code
669487Color Description
Opal BlueLens Color
Dark Grey
Size Details
Size DetailsBridge Width
16.00Temple Length
145.00Size
5416-145
Bridge Width
16.00Temple Length
145.00Size
5416-145
Bridge Width
16.00Temple Length
145.00Size
5416-145
Bridge Width
16.00Temple Length
145.00Size
5416-145
Bridge Width
16.00Temple Length
145.00Size
5416-145
Bridge Width
16.00Temple Length
145.00Size
5416-145
Bridge Width
16.00Temple Length
145.00Size
5416-145
Bridge Width
16.00Temple Length
145.00Size
5416-145
Loe my new glasses
They are very light and comfortable. Love the design and color too.
The sunglasses are good but the shipping time was awful.
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Frequently Asked Questions
Are Ray-Ban RB4378 sunglasses prescription-ready?
Yes, the Ray-Ban RB4378 is fully prescription-ready and compatible with single vision, bifocal, and progressive lenses. The 54mm lens width and full-rim construction provide ample space for prescription lens installation, making them ideal for those who need corrective eyewear with sun protection.
What face shapes do the Ray-Ban 4378 sunglasses fit best?
The RB4378's square shape is especially flattering on oval, round, square, and heart-shaped faces. The angular design provides contrast to softer face shapes, while the 54mm lens width and high bridge fit ensure a comfortable, balanced look across a variety of facial structures.
How does the Ray-Ban 4378 compare to the Erika or Wayfarer?
The RB4378 is lighter than both the Erika and Wayfarer, thanks to its injected nylon construction. It offers a more angular, square silhouette compared to the Erika's rounded shape, and a more feminine, streamlined profile than the classic Wayfarer. Customers who want Wayfarer quality in a lighter frame often prefer the 4378.
Do Ray-Ban 4378 sunglasses have UV protection?
Yes, all Ray-Ban RB4378 sunglasses provide 100% UVA and UVB protection, shielding your eyes from harmful ultraviolet rays. Select variants also feature polarized lenses, which reduce glare from reflective surfaces like water, snow, and pavement for enhanced visual comfort.
What is the difference between the RB4378 and RB4376?
The RB4378 is a newer, more minimal interpretation of the RB4376. Both draw inspiration from Ray-Ban's 1984 cat-eye frames, but the 4378 features a cleaner, more angular square design with a lighter feel. The 4378 is designed for those who want the heritage of the 4376 in a more contemporary, streamlined package.
What are the measurements of the Ray-Ban RB4378?
The Ray-Ban RB4378 measures 54mm lens width, 16mm bridge width, and 145mm temple length, with a lens height of approximately 47mm. These dimensions provide a medium-to-large fit with generous coverage, making them suitable for most adult face sizes while maintaining a feminine, proportional look.
Compare With Similar Frames
How the Ray-Ban 4378 Sunglasses stacks up against the closest alternatives we carry.
- Softer, more rounded shape for a classic feminine look
- Slightly larger lens coverage in some variants
- Iconic Erika design with wider brand recognition
Read the full comparison
Ray-Ban RB4378 vs. Ray-Ban Erika 4171: Which Sunglasses Are Right for You?
Both the Ray-Ban RB4378 and the Ray-Ban Erika 4171 are popular women's sunglasses that combine lightweight comfort with prescription-ready versatility. But which one fits your style?
Design & Shape
The RB4378 features a more angular, square silhouette inspired by Ray-Ban's 1984 cat-eye frames, offering a contemporary, structured look. The Erika 4171, by contrast, has a softer, rounded shape that leans into classic femininity. If you prefer sharper lines and a modern edge, the 4378 is your frame. If you want a timeless, gentle curve, go with the Erika.
Weight & Comfort
Both frames are constructed from lightweight nylon, but the RB4378's more minimal design gives it a slightly lighter feel on the face. Customers who've worn both often describe the 4378 as "barely there" compared to the Erika's slightly more substantial presence.
Face Shape Compatibility
The RB4378's square shape flatters oval, round, square, and heart-shaped faces, providing angular contrast. The Erika's rounded design works especially well on square and angular faces, softening strong jawlines. Both offer a high bridge fit for comfort.
Our Recommendation
Choose the Ray-Ban RB4378 if you want a lighter, more angular frame with a contemporary edge—perfect for those who love the Wayfarer aesthetic but want something more feminine and minimal. Choose the Ray-Ban Erika 4171 if you prefer a softer, rounder silhouette with a bit more presence and classic appeal.
At a Glance
Ray-Ban Erika 4171 Sunglasses
Pros:
- Softer, more rounded shape for a classic feminine look
- Slightly larger lens coverage in some variants
- Iconic Erika design with wider brand recognition
Cons:
- Less angular and modern than the 4378
- May feel less structured for those who prefer sharper lines
- Similar weight but slightly bulkier appearance