Caterpillar Streamline Leather Composite Toe Work Shoe Men's CAT Footwear. Love the look of the Streamline but want something leather? We now have you covered. The Streamline Leather Work Shoe is a non-metallic full grain leather oxford that is lightweight and incredibly comfortable. Best for light industrial occupations like warehousing, general contractor work or even airport security.. ASTM F2413-11 Non-Metallic Composite Toe protects against impact or compression. Full Grain Leather Upper Oxford. Nylon Mesh Lining.