For the US market, products must comply with CPSIA (Consumer Product Safety Improvement Act), especially regarding lead and phthalate content in dyes and plastics. For the EU, adherence to REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) is mandatory to ensure no harmful substances are present. If you are marketing 'eco-friendly' slippers, verify GRS (Global Recycled Standard) or OEKO-TEX Standard 100 certifications to validate sustainability claims and chemical safety.