The useful decision in the Longfin is protection level and coverage. The only Smith specs we have are for the Longfin Elite, which Smith positions as a tactical-protection pair with an emphasis on impact resistance. Smith lists high-impact lens material and ANSI Z87.1 compliance for that model.
Smith also calls out a 6-base lens curve and a hydrophilic Megol temple material intended to improve grip when wet. UV protection is listed as 100% UVA/B/C. Smith backs the Longfin Elite with a limited lifetime warranty.
