Filtrate Proper Sunglasses - Filtrate Proper sunglasses. A colab sunglass from Filtrate and the boys from Hollywood's The Proper Barbershop. 'Working Class' (written by John Caleb) written on the inside of the arm. Acetate cellulose frames with Filtrate logo plates at temples. Stainless steel hinges. CR-39 scratch and impact resistant lens. 100% UV protection. Imported.