Since phone straps are in constant contact with skin, they must meet strict chemical safety standards. For the EU market, ensure products are REACH compliant (Registration, Evaluation, Authorisation, and Restriction of Chemicals). For the US market, materials should be lead-free and phthalate-free, adhering to CPSIA standards if marketed toward younger demographics. Additionally, check for OEKO-TEX Standard 100 certification if the strap uses textile components to guarantee no harmful substances are present.