Availability: 5 in stock
The Maui Jim KUPA’A MJ641 sunglasses bring classic square styling and world-class lens technology together in a frame built for everyday outdoor life. Named after the Hawaiian word meaning “steadfast,” these unisex sunglasses deliver the optical clarity and glare protection that have made Maui Jim a favorite among people who spend serious time outside.
The KUPA’A features Maui Jim’s SuperThin Glass lenses—32% thinner and lighter than standard glass, offering the absolute crispest optics in the brand’s lineup. Glass delivers superior scratch resistance compared to any plastic or composite material, making these sunglasses ideal for long-term wear. If you fish, drive long distances, or simply want the sharpest view possible, glass is the material to choose. The tradeoff is weight: SuperThin Glass is still Maui Jim’s heaviest lens option, though the 55mm lens size keeps the overall feel balanced and comfortable for medium faces.
Every pair of KUPA’A sunglasses is equipped with Maui Jim’s patented PolarizedPlus2 lens technology, which goes far beyond basic polarization. The lenses eliminate 99.9% of glare, block 100% of harmful UVA and UVB rays, and manage high-energy visible (HEV) blue light. A proprietary blend of three rare earth elements enhances reds, greens, and blues, so colors appear more saturated and vivid than with standard dark lenses. The result is better contrast, sharper depth perception, and less eye fatigue—even in the harshest light conditions. An anti-reflective coating on the back of each lens absorbs bounce-back glare, and a hydrophobic treatment on both sides makes water, sunscreen, and oils bead up and wipe away easily.
The KUPA’A’s full-rim nylon frame is lightweight and durable, featuring a keyhole-style bridge and a 55mm lens width with an 18mm bridge—a medium fit that reviewers describe as sitting between medium and large. The temples are where this model stands out: a signature native pattern runs along the temple core exterior, echoed in the rubber temple tips that provide a secure, no-slip grip. The 145mm temples and 3-barrel hinges ensure long-lasting durability. Available in four frame and lens combinations—including Shiny Black with Neutral Grey, Shiny Trans Grass Green with Neutral Grey, Shiny Trans Light Brown with Maui HT, and Shiny Dark Havana with HCL Bronze—the KUPA’A adapts to different light conditions and personal styles.
“The build quality is top notch and the lenses are excellent.” — Tommy Bahama customer review
The KUPA’A is prescription-compatible. Maui Jim offers 96% of its sunglasses in prescription, including single vision and progressive lenses, through authorized optical retailers. The frames come with a 2-year warranty against defects in materials and workmanship, and Maui Jim provides repair services and free replacement nose pads and temples as long as parts remain available. These sunglasses are saltwater-safe and corrosion-resistant, built to handle beach days, boat trips, and daily wear without breaking down.
If you want the sharpest optics Maui Jim offers in a versatile square frame that works from the city to the trail, the KUPA’A MJ641 delivers.
