Compliance is critical to avoid customs seizures. For the US market, ensure products are CPSIA compliant, specifically testing for lead and phthalates content. For the EU, products must adhere to REACH regulations regarding hazardous chemicals. Additionally, verify that the outsoles meet ASTM F2913-19 or ISO 20344 standards for slip resistance, especially if the slippers are marketed for poolside or bathroom use. Always ask for third-party lab reports (SGS, ITS, or TUV) before finalizing the order.