Blenders M Class X2 SunglassesWe designed the 'M Class X2' to offer a refined blend of style and engineering. Featuring polarized lenses for superior clarity, spring hinges for enhanced durability, and all metal temple stripes for a sleek touch, this collection delivers both performance and sophistication. The M Class is one of our more classic designs featuring spring loaded hinges that allow the arms to comfortably adjust to a majority of head sizes.