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UV Protection Category: 3. Lens Type: Mirror. Acetate: Acetate is hypoallergenic| lightweight| and can come in many different colours. Polycarbonate: Polycarbonate is lightweight| comfortable| impact resistant| and provides UV protection. Repel water and dust to optimize vision.Rainbow lenses (RW) undergo a surface mirroring process to reduce light blinding and glare from water| snow and ice.