Factor and Frontline are also the same lens, fits both
lenses provides 100% protection from harmful UVA/B/C
From KT of Durango, Colorado on 9/17/2012.
The replacement lenses are great. I always keep a spare pair around because I scratch lenses fairly quickly and you never know when they will discontinue the sunglasses. Prolens has a good assortment of replacement lenses and the service is great!
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