I biked with these photochromic glasses, and the heads-up display was game-changing
Briefly

The Engo 2 Photochromic glasses have significantly enhanced my outdoor exercise experience by providing a crystal clear heads-up display, eliminating the need to glance at my watch.
The glasses work seamlessly with Apple, Garmin, and Suunto watches, displaying key metrics, including a unique Strava Live Segment view, motivating users to push for personal records.
Read at ZDNET
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