Koo Alibi sunglasses [from RoadTrailRun]
Original review on RoadTrailRun HERE
Like many runners, I’m on a relentless pursuit of the ideal sunglasses: a featherweight design, an unobstructed view of the path, and adequate protection from the elements - oh, and comfortable. The Koo Alibi sunglasses recently emerged as a contender in this quest, and after putting them through the paces on various runs and a few bike rides, I'm here to tell you that they are a solid pair of eyewear.
Features
The Alibi sunglasses are incredibly lightweight, weighing only 21 grams, making them feel practically invisible on my face. This is a significant advantage for runners aiming to maximize their efficiency during runs. The half-frame design further enhances this by providing an extensive and clear view of the path ahead, eliminating the need for awkward head movements. The Alibi sunglasses are a perfect choice for runners looking for a combination of comfort, performance, and style.
Fit
Aside from its weight and appearance, the Alibi offers a secure and comfortable fit. The ear stems are sturdily built, avoiding the common problem of flimsiness, ensuring they remain firmly in place during strenuous workouts and on rough trails. The well-designed nose bridge, a frequently overlooked detail, effectively prevents fogging and maintains a sweat-free experience. Additionally, the glasses can be securely placed atop the brim of a hat or the front holes of a helmet, providing a convenient option when you need a break from wearing them.
Utility
The true star of the Alibi show lies in their photochromic lenses. These intelligent lenses adapt to varying light conditions, seamlessly transitioning from clear to darker shades as the sun rises and sets. This adaptability proved invaluable during my early morning runs. In the pre-dawn twilight, the lenses remained remarkably clear, allowing for excellent visibility on dimly lit paths. As the sun rose and the light intensified, the lenses gradually darkened, providing a comfortable level of shade without compromising clarity.
However, it's important to note that the transition speed of the photochromic lenses isn't instantaneous. While the change is subtle and hardly noticeable during most activities, it's something to keep in mind for situations with rapidly changing light conditions. For instance, transitioning from a brightly lit forest path into a deeply shaded tunnel might require a few seconds for the lenses to adjust completely.
The 87% VLT (Visible Light Transmission) of the lenses are pretty good for very low-light conditions or night runs. By contrast, while the 15% VLT offered sufficient protection for most sunny days in my experience, some runners, particularly those venturing into extremely bright, high-altitude areas with snowy reflection, might find them lacking in terms of sun protection.