Acetate with an edge. Sierra takes Rockwell's premium acetate and gives it attitude: Black Ember, Black Pink, and classic Black/Black — three colourways where the pattern lives inside the material itself. Handcrafted in Italy, Sierra is the acetate frame for people who find the classics a little quiet. Don't settle for sunglasses made of cheap plastics that could leach into your skin. Know what your sunglasses are made of. Sierra's material is named: premium acetate — cellulose acetate derived from cotton and wood pulp, its colour and pattern mixed through the depth of the sheet before it hardens, so nothing sits on the surface to flake or peel. Cast, cured, and cut the way Italian acetate has always been made. The Lens Every Sierra colourway wears a black lens with UV400 protection — 100% of UVA and UVB, blocking wavelengths up to 400 nanometres, while ordinary "UV sunglasses" are only required to block 75%. The frame makes the statement; the lens does its job completely.