The category number indicates the filter strength against sun glare.
Category 0: very limited reduction
Category 1: limited reduction
Category 2: good protection
Category 3: high protection
Category 4: very high protection
OUR CORE LENSES
Category 1: Mango, Peach and Guava Clear.
Category 2: Red lenses. Acai, Kiwi, Coco and Aqua Clear. Aqua and Mango Mirror.
Category 3: Black and brown lenses, Black gradient and tinted lenses, Acai, Coco, Guava, Kiwi and Peach Mirror.