triangle-logo square-frame sunglasses triangle-logo square-frame sunglasses from PRADA EYEWEAR featuring tortoiseshell effect, triangle logo, tinted lenses, UV-protective lenses, square frame, straight arms, angled tip and black/yellow. All glasses from FARFETCH are sold as non-prescription frames.. These glasses come with a protective case.. Composition Acetate 100% SIZE & FIT Measurement Arm Length 5.5 in(14 cm) Bridge Width 0.8 in(2 cm) Lens Diameter 2.1 in(5.5 cm) Total Width 5.8 in(15 cm)