When evaluating footbath basins, prioritize material durability and safety features. For plastic models, ensure the use of PP (Polypropylene) or TPE (Thermoplastic Elastomer) for collapsible versions, as these are heat-resistant and BPA-free. For high-end or commercial use, solid wood (like cedar or oak) with waterproof coatings or acrylic is preferred. Key technical features should include PTC heating elements for stable temperature control, leakage protection switches (GFCI), and integrated massage rollers (manual or motorized). Ensure the basin has a minimum depth of 20cm to allow for calf-high soaking, which is a standard requirement for therapeutic use.