Shape and Structure

Rayban Silver Square Sunglasses Grey Gradient RB3666 construction defin unisex sit in a geometric category that Ray-Ban classifies as irregular — a squared silhouette with subtly softened lower corners that prevents the frame from reading as a purely hard-edged rectangle. Furthermore, the slim metal construction keeps the overall visual weight of the frame light, which means the bold double-bridge sits as the primary design statement rather than the frame mass itself. The full-rim metal construction wraps cleanly around both lenses. As a result, the frame reads as structured and precise from every angle.

Lens Colour and Gradient Profile

The 71 lens code delivers a grey gradient dark grey — one of the most versatile tinted lens options in the Ray-Ban range. The gradient runs from a darker grey at the top of each lens, fading progressively toward a lighter grey tone at the lower edge. In addition, this gradient quality means the lens reads differently in varying light conditions — darker and more shaded at the top where light is most intense, lighter at the lower field. The lens material is confirmed as crystal. The tint sits at a medium-to-dark density at the upper zone. Consequently, the silver frame and cool grey gradient lens work together in a cohesive tonal relationship throughout.

Metal Arms and Hardware Construction

The temples of the RB3666 deliver one of the most visually interesting details of this model. They transition from a flat, rectangular cross-section near the hinge into a cylindrical, rope-textured finish along the mid-arm section. This texture is clearly visible along the upper temple in the side-view image. Moreover, the shift from flat to cylindrical within the same temple arm is an intentional design detail that gives the frame a considered, tactile quality. The hinge hardware is finished in the same silver tone as the front frame. The temple tips are finished in a tortoiseshell acetate — a warm, patterned detail that contrasts softly against the cool silver metal of the arms. Adjustable silicone nose pads sit on metal saddles at the bridge, clearly visible from the front.

Frame Measurements at a Glance

The RB3666 is confirmed at 56-17-140 sizing. The 56mm lens width places this frame in the medium-large range for a square metal sunglass — generous enough to provide substantial coverage without reading as oversized. The 17mm bridge is a standard width for slim metal frames. Similarly, the 140mm temple length suits most adult head widths. The slim metal construction means the overall frame weight reads lighter than the 56mm lens width might suggest at first. Buyers currently wearing 54mm frames will notice a modest but visible step up in coverage with this model.

Occasions and Styling

The RB3666 003/71 works across a wide range of outdoor and casual settings. Because the silver-grey colourway sits in a cool, neutral tonal range, it pairs naturally with both warm and cool clothing palettes without competing for attention. It suits city wear, travel, weekend outdoor use, and driving equally well. In addition, the unisex classification means this model works across genders without modification. The grey gradient lens density suits bright daylight rather than low-light conditions. Those exploring further options across the full designer sunglass range can browse our designer sunglasses collection for additional styles across brands and lens types.

Buyers specifically looking for new season additions in the men’s sunglass range can also explore our men’s new arrivals section for the latest additions.

The RB3666 in 003/71 is a full-rim metal square unisex sunglass, confirmed at 56-17-140 with a slim double-bridge, grey gradient dark grey crystal lenses, rope-textured temples, and tortoiseshell acetate temple tips.