Key factors include UV protection, lens type (polarized vs non-polarized), fit and coverage, frame durability, and non-slip features for active wear.

Consider glare reduction (lens tint and polarization), UV400 protection, how well the frames fit your face, and overall build quality. Also note if lenses are interchangeable or if there are options for different light conditions.

Think about your sport: runners and cyclists benefit from wraparound frames and non-slip nose pads, while outdoor use may favor durable materials and lighter weight. Interchangeable lenses or polarized options can add versatility.

Choose polarized lenses with full-coverage wrap for better glare reduction, and a darker tint to maintain contrast in bright sun. Ensure a secure fit to stay comfortable during movement.