When sourcing Power Bands, prioritize 100% Natural Malaysian Latex over TPE or synthetic rubber, as natural latex offers superior elasticity, tensile strength, and resistance to snapping. Ensure the manufacturer uses a continuous layering process rather than a molded process; layered bands are significantly more durable and less likely to snap suddenly during high-intensity use. Always request the Shore Hardness rating and verify that the bands can be stretched to 3-4 times their original length without permanent deformation.