Ray Ban RB4378 Sunglasses
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Modern Angular Design Rooted in an Icon
The RB4378 is Ray-Ban's contemporary reinterpretation of the RB4376, reaching back to the angular geometry of the brand's 1984 cat-eye frames and sharpening it for a modern sensibility. The result is a square silhouette that reads cleaner and more architectural than its predecessor while keeping the unmistakable feminine lift that made the original iconic.
The injected frame delivers the smooth, consistent finish that Ray-Ban's injection-molded construction is known for: precise curves, a solid feel in hand, and long-term resistance to the warping that affects lesser acetate or metal builds. The polished frame surface catches light cleanly without looking flashy.
Gradient Lenses for Real-World Versatility
The RB4378 is fitted with polycarbonate lenses in a gradient treatment. Polycarbonate is Ray-Ban's choice for impact-resistant, lightweight performance, and the gradient treatment means the lens transitions from its darkest tint at the top to a lighter tint at the bottom. This gives you full glare protection when you look out toward the horizon while keeping your field of view naturally bright when you look down, making the frame as practical for driving and outdoor dining as it is for the beach.
Fit and Dimensions
The RB4378 is built on a Regular fitting with a High Bridge Fit architecture. Key measurements from Ray-Ban's spec sheet: hinge-to-hinge width of 127mm, lens height of 46.9mm, a 54/16mm bridge, and 145mm temples. These proportions suit a medium to wide face without overwhelming smaller features, and the square lens shape balances rounder face structures particularly well.
Ray-Ban includes its standard case and cleaning cloth. The temples carry the classic Ray-Ban script logo on the exterior arm, visible in the product imagery above.
Ray-Ban RB4378 vs RB4376
| Feature | RB4378 | RB4376 |
|---|---|---|
| Silhouette | Contemporary square with angular lines | Original cat-eye with softer curves |
| Frame material | Injected | Injected |
| Lens treatment | Gradient available | Gradient available |
| Design era | Modern reinterpretation | 1984 original inspiration |
Shop In Store and Online
The Ray-Ban RB4378 is available at Island Water Sports in South Florida and through our online store. Our team can help you compare fit with similar Ray-Ban silhouettes in person. Call us at 954-427-4929 or visit in store.
Free Shipping, No Minimum for IWS Beach Club Members.
Returns are eligible within 30 days of receiving your order. Return shipping labels are FREE for IWS Beach Club Members. See more
Specifications
- Brand
- Ray-Ban
- Model
- RB4378
- Frame Shape
- Square
- Frame Material
- Injected
- Lens Treatment
- Gradient
- Lens Material
- Polycarbonate (Poly)
- Fitting
- Regular
- Bridge & Nosepads
- High Bridge Fit
- Hinge to Hinge
- 127mm
- Lens Height
- 46.9mm
- Bridge Width
- 54/16mm
- Temple Length
- 145mm
- Gender
- Women's
- MPN
- itemMatrix-5487
Frequently Asked Questions
- Are the Ray-Ban RB4378 sunglasses polarized?
- The RB4378 is offered with gradient lenses. Polarized lens options vary by configuration. Check the variant selector on this page or contact us at 954-427-4929 to confirm lens treatment on the specific option you want.
- What is the difference between the Ray-Ban RB4378 and the RB4376?
- The RB4378 is a modern reinterpretation of the RB4376. It takes the same feminine angular inspiration from Ray-Ban's 1984 cat-eye heritage but refines the silhouette with cleaner, more contemporary square lines. The RB4378 reads sharper and more architectural while the RB4376 retains softer classic curves.
- What face shape does the Ray-Ban RB4378 suit?
- The square frame shape and angular lines of the RB4378 balance rounder and oval face structures particularly well. The 127mm hinge-to-hinge width and Regular fitting suit medium to wide faces.
- What does the gradient lens treatment mean on the RB4378?
- Gradient lenses are darkest at the top of the lens and transition to a lighter tint toward the bottom. This gives maximum glare protection when looking out toward the horizon while keeping the lower field of view brighter, which is practical for driving and outdoor use.
- What material is the RB4378 frame made from?
- The RB4378 frame is made from injected plastic. Ray-Ban's injection-molding process produces consistent, smooth curves and a durable finish that resists warping over time.
- Can I try the Ray-Ban RB4378 in store at Island Water Sports?
- Yes. The RB4378 is available at Island Water Sports in South Florida. Call 954-427-4929 or visit us in store to try the frame on and compare it with similar Ray-Ban silhouettes.
- What is included with the Ray-Ban RB4378?
- Ray-Ban sunglasses come with the brand's standard hard case and a microfiber cleaning cloth.