When sourcing PU (Polyurethane) stress items, the most critical factor is material safety and non-toxicity. You must ensure the products are BPA-free, Phthalate-free, and Lead-free. For the US market, compliance with ASTM F963 (Standard Consumer Safety Specification for Toy Safety) and CPSIA is mandatory. For the EU market, products must meet EN71 Parts 1, 2, and 3 standards and carry the CE mark. Always request REACH compliance certificates to ensure no restricted chemicals are used in the foam or paint.