Consider fit, lens quality, and protection: choose a size that suits your face and ensure 100% UV protection; select a lens type that matches your typical light conditions.

Key factors are frame size (classic vs Mega), lens type (plain vs polarized), and frame material (plastic/acrylic). Also check UV protection and the colorway that fits your style.

Classic RB2140s offer timeless styling and standard sizing, while Meta Gen 2 variants may differ in frame dimensions or lens options—compare specs to match your fit and look.

Pick polarized lenses with UV protection to reduce glare; a Mega frame can provide extra shade if you need more coverage.