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Engineering meets elegance.
The Ray-Ban RB3721 represents a distinct proposition within the Ray-Ban range — a frame where precision metal engineering and advanced materials technology combine to deliver something that looks sharp, wears lightly, and performs with quiet authority. This is a considered choice for the wearer who values substance behind the style.
Built on Ray-Ban's platform, the RB3721 uses a sophisticated combination of metal and high-performance nylon to achieve a frame that is meaningfully lighter than its size and presence would suggest — a quality that becomes increasingly appreciated over the course of a full day's wear.
Frame & Fit
Lens Technology
The Optical Perspective
The 3721 collection addresses a genuine need that many eyewear customers articulate but rarely see satisfied at this price point — the desire for a large, metal-framed sunglass that does not impose itself physically over a long day of wear. The combination of metal front and Liteforce nylon temples achieves a meaningful reduction in overall weight compared to conventional all-metal frames of this size, without any visible compromise to the frame's aesthetic authority.
The 59mm lens width makes this one of the larger fits in the Ray-Ban range — a strong, commanding choice that suits medium-large to large face shapes and is particularly well suited to square, oval, and oblong facial profiles where the broad horizontal lens line reinforces and flatters the natural structure of the face.
For customers who spend significant time driving, outdoors, or on the water, the solid dark grey lens offers a high level of light management in consistently bright conditions — a more assertive choice than a gradient lens, and one that delivers reliable, consistent visual comfort across the full lens aperture.
Product Specifications
Suitable for: Medium-large to large face shapes | Unisex styling Recommended for: Driving, outdoor leisure, coastal environments, extended all-day wear
| Frame Width | Depth | Lens Diameter | Nose Bridge | Arm length |
 |
 |
 |
 |
 |
| 144mm | 47mm | 62mm | 17mm | 145mm |
Your satisfaction guaranteed...
Our policy is simple! In the unlikely event that you do not like the glasses that you order from us, we'll exchange them for a more suitable pair or give you a refund.
See our full return policy here.
Because our glasses are custom made to your prescription, delivery normally takes between three and ten days depending on the complexity of your prescription. Rest assured that we do our very best to get your order to you as quickly as possible.
We offer free UK delivery on orders over £40 and free International delivery on orders over £100.
Buy prescription glasses online with confidence at Glasses2You. Enjoy a 100% satisfaction guarantee, 30 day returns and free UK delivery, plus affordable international delivery with tracked and signed shipping.
We use the same glazing processes, technology and suppliers as high street opticians, so you get quality prescription spectacles and reading glasses at a fraction of the price. Pick up spare pairs for work, home and the car, or choose different styles to suit every occasion without the high street cost.