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The Ray-Ban RB8421 eyeglasses combine modern square styling with advanced materials for all-day comfort. Built from lightweight stainless steel with a full-rim design, these prescription-ready frames feature bi-layered color combinations and distinctive carbon fiber temple details that set them apart from standard metal frames.
Lightweight Metal Construction Meets Carbon Fiber Comfort
The RB8421 uses a stainless steel front that's both durable and remarkably light on your face. The temples incorporate carbon fiber detailing—a material borrowed from aerospace and high-performance applications—that reduces weight while adding flex and strength. Adjustable nose pads let you dial in the perfect fit, preventing slippage whether you're at your desk or on the move. Available in two sizes (52mm and 54mm lens width), the 19mm bridge and 145mm temples suit a wide range of face shapes.
These frames ship prescription-ready, so you can add single-vision, progressive, or reading lenses to match your exact needs. The full-rim construction protects your lenses and gives the frame clean definition from every angle.
Versatile Square Shape for Work and Everyday Wear
The square frame shape works across face types, offering sharp angles that balance rounder features while staying versatile enough for professional or casual settings. Color options include Black on Silver (2861), Grey on Silver (3125), Blue on Gunmetal (3124), Matte Black on Black (2904), and Brown on Arista (3126)—each with contrasting temple accents that add visual interest without overwhelming the design.
Part of Ray-Ban's Performance collection, the RB8421 delivers the brand's signature quality in a contemporary silhouette. The unisex design and adjustable fit make these frames a practical choice for anyone seeking lightweight, durable eyewear that doesn't compromise on style.
Product Details
Product DetailsModel
0RX8421Shape
Gender
Material
Bridge Type
Rim Type
Age Group
Color Details
Color DetailsColor Code
2861Color Description
Black On SilverFrame Color
Black
Color Code
3125Color Description
Grey On Silver
Color Code
3124Color Description
Blue On Gunmetal
Color Code
2861Color Description
Black On SilverFrame Color
Black
Color Code
3126Color Description
Brown On AristaFrame Color
Brown
Color Code
3126Color Description
Brown On AristaFrame Color
Brown
Color Code
3125Color Description
Grey On Silver
Color Code
2904Color Description
Matte Black On BlackFrame Color
Black
Color Code
3124Color Description
Blue On Gunmetal
Color Code
2904Color Description
Matte Black On BlackFrame Color
Black
Size Details
Size DetailsBridge Width
19.00Temple Length
145.00Size
5419-145
Bridge Width
19.00Temple Length
145.00Size
5219-145
Bridge Width
19.00Temple Length
145.00Size
5219-145
Bridge Width
19.00Temple Length
145.00Size
5219-145
Bridge Width
19.00Temple Length
145.00Size
5419-145
Bridge Width
19.00Temple Length
145.00Size
5219-145
Bridge Width
19.00Temple Length
145.00Size
5419-145
Bridge Width
19.00Temple Length
145.00Size
5419-145
Bridge Width
19.00Temple Length
145.00Size
5419-145
Bridge Width
19.00Temple Length
145.00Size
5219-145
Great place to buy frames. My dog chewed my frames up so I bought new ones. They communicated well and had a very good price on them. I would definitely recommend them!
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Frequently Asked Questions
Are the Ray-Ban 8421 eyeglasses prescription-ready?
Yes, the Ray-Ban RB8421 frames are fully prescription-ready and can accommodate single-vision, progressive (no-line bifocal), or reading lenses. The full-rim metal design securely holds prescription lenses of varying thicknesses, and the adjustable nose pads help ensure proper optical alignment for clear vision.
What material are Ray-Ban 8421 frames made from?
The RB8421 frames feature a stainless steel front with carbon fiber temple details. Stainless steel provides durability and corrosion resistance, while the carbon fiber components reduce overall weight and add flexibility for enhanced comfort. This combination delivers a high strength-to-weight ratio similar to materials used in aerospace applications.
Do Ray-Ban 8421 eyeglasses have adjustable nose pads?
Yes, the RB8421 includes adjustable nose pads that can be customized for a secure, comfortable fit. Metal-frame nose pads can be gently adjusted inward for a tighter fit or outward for a looser fit, making them ideal for people with low or high nose bridges and helping prevent the frames from sliding down your face.
What size options are available for the Ray-Ban RB8421?
The RB8421 is available in two sizes: 52-19-145 and 54-19-145. The first number (52 or 54mm) is the lens width, 19mm is the bridge width, and 145mm is the temple length. The 52mm size suits small to medium faces, while the 54mm works for medium to large faces.
How much do Ray-Ban 8421 eyeglasses weigh?
While exact weight isn't specified, the RB8421 is designed as a lightweight frame thanks to its stainless steel and carbon fiber construction. Customer reviews consistently mention the frames feel "unbelievably light" and comfortable for all-day wear, with some users noting they sometimes forget they're wearing glasses.
What's the difference between Ray-Ban 8421, 8415, and 8416?
The RB8421 features a square shape with stainless steel and carbon fiber temple details, while the RB8415 and RB8416 have more carbon fiber throughout the frame construction and slightly different rectangular shapes. The 8421 offers a more traditional metal frame feel with carbon fiber accents, whereas the 8415/8416 are part of Ray-Ban's Tech series with heavier carbon fiber integration.
Compare With Similar Frames
How the Ray-Ban 8421 Eyeglasses stacks up against the closest alternatives we carry.
- Similar carbon fiber technology for lightweight comfort
- Comparable price range ($138-$276)
- Square-rectangular hybrid shape for versatility
Read the full comparison
Ray-Ban 8421 vs. 8415 vs. 8416: Which Carbon Fiber Frame Is Right for You?
If you're drawn to Ray-Ban's lightweight metal frames with carbon fiber technology, the RB8421, RB8415, and RB8416 all deliver exceptional comfort—but each has distinct characteristics.
Ray-Ban RB8421 (this frame) strikes a balance between traditional metal construction and modern carbon fiber accents. The stainless steel front provides classic durability, while carbon fiber temple details reduce weight and add flex. The square shape is universally flattering and works equally well in professional or casual settings. With five color combinations including bi-layered options, it offers the most variety in this comparison.
Ray-Ban RB8415 goes deeper into carbon fiber territory as part of the Tech series, with more extensive carbon construction throughout the frame. This makes it even lighter than the 8421, ideal if minimal weight is your top priority. The rectangular shape is slightly more contemporary and sporty. However, the 8415 typically carries a premium price and the rectangular silhouette may not suit rounder face shapes as well as the 8421's square design.
Ray-Ban RB8416 offers a square-rectangular hybrid shape that falls between the other two models. It shares the carbon fiber technology and similar pricing to the 8421, making it a close alternative if you prefer a slightly more elongated lens shape. The 8416 is a solid choice for medium to large faces seeking a modern look with lightweight performance.
Our recommendation: Choose the RB8421 if you want a versatile square frame with proven stainless steel durability, carbon fiber comfort, and the widest color selection. Opt for the RB8415 if you prioritize absolute minimum weight and prefer a rectangular Tech aesthetic. Consider the RB8416 if you like the 8421 but want a slightly more elongated lens shape. All three deliver Ray-Ban quality and prescription-ready versatility.
At a Glance
Ray-Ban 8415 Eyeglasses
Pros:
- More extensive carbon fiber construction for even lighter weight
- Rectangular shape offers a slightly different aesthetic
- Part of Ray-Ban's premium Tech series
Cons:
- Typically higher price point ($137-$261 vs $249-$276)
- Rectangular shape may not suit all face types as well as the square 8421
- Less traditional metal frame appearance
Ray-Ban 8416 Eyeglasses
Pros:
- Similar carbon fiber technology for lightweight comfort
- Comparable price range ($138-$276)
- Square-rectangular hybrid shape for versatility
Cons:
- May have less color variety than the 8421
- Similar styling means less differentiation if you want a distinct look
- Carbon fiber frames can be more delicate than full stainless steel