radium: adaptability and style. the salomon radium sigma goggle is just right for all mountain fans who place particular value on adaptability and style. the sigmaâ„¢ lens reduces glare and improves terrain awareness, three layers of foam provide comfort from morning to night and the airflow system ensures clear vision at all times.sigmaâ„¢ lensthe sigmaâ„¢ lenses provide better contrast vision so you can see the details of the terrain more quickly in all lighting conditions.