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.