When sourcing professional work footwear, you must ensure compliance with ASTM F2413-18 (Standard Specification for Performance Requirements for Protective Footwear) for the US market, or EN ISO 20345:2011 for the European market. Key features to verify include Impact Resistance (I), Compression Resistance (C), and Electrical Hazard (EH) protection. For specialized environments, ensure the shoes meet SRC slip-resistance ratings, which test for grip on ceramic tile with SLS and steel floors with glycerol.