Built to be worked in, not worried about. Don't settle for sunglasses made of cheap plastics that could leach into your skin. Know what your sunglasses are made of. Anvil is Rockwell's hard-use frame: TR90 Swiss nylon in our Structa-Lite™ build, handcrafted in Northern Italy — the material is named on the spec sheet, not hidden behind a trademark and a shrug. TR90 is the material that changed work eyewear — it flexes under force and springs back to its intended shape without cracking, creasing, or warping, at roughly twice the impact resistance of basic sunglasses and about half the weight of an acetate frame. On the roof, on the range, on patrol, on the tools from first light to last — Anvil is made for people whose eyewear is equipment, not an accessory. Six of the seven Anvil colorways here are floatable builds — for work that ends at the water. The two safety colorways, Black and Clear, carry Z87+ rated Carl Zeiss Impacto lenses finished with Pürcoat™ Ultra Clear; the Black safety build floats, and the Clear safety build is the line's one standard, non-floatable build. Yellow, Red, Silver, and Green are polarized; Red, Silver, and Green add a mirrored finish, and Clear is there for low light and indoor work. The Lens Every Anvil lens is UV400 — 100% UVA and UVB protection, up to 400 nanometers. Four of the floatable lenses (Yellow, Red, Silver, Green) are polarized to cut glare and carry an oleophobic coating; Red, Silver, and Green are mirrored. The two safety lenses — Black and Clear — are Carl Zeiss Impacto, rated Z87+ with a Pürcoat™ Ultra Clear finish, and the Black safety lens carries an oleophobic coating as well. Both Clear lenses are unpolarized — the low-light options — and the floatable Clear floats like the rest of the floatable builds.