GU7878 — Women's Sunglasses. The Guess GU7878 presents a squared silhouette built from injection-molded plastic, suitable for daily wear and special events. The design blends fashion with practicality, making it a strong pick for those after a bold outdoor accessory. Guess captures the brand’s carefree, alluring vibe in these sunglasses. Measurements: 55-16-140. The 55 mm lens width indicates each lens, the 16 mm bridge is the gap between lenses at the nose, and the temples are 140 mm long. A 55 mm lens size is particularly flattering for oval, round, and heart-shaped faces. Frame and fit: The square perimeter forms clean right angles, lending character while balancing the face’s softer features. The full-rim frame clearly defines the lens edge and adds visual solidity to the overall look. Lens details: The lenses offer UV400 protection, blocking 100% of UVA and UVB radiation. With a Category 3 sun filter rating, they are suited for driving and high levels of outdoor sun exposure.