Bath sponges are primarily categorized into Natural Sea Sponges, Synthetic Polyurethane (PU), and PE Mesh (Loofahs). Natural sponges are highly absorbent and hypoallergenic, making them ideal for sensitive skin and baby care. Synthetic PU sponges are cost-effective and can be infused with charcoal or vitamin E, while PE Mesh loofahs are best for exfoliation and maximizing soap lather. For B2B buyers, selecting the material should align with the target market's price sensitivity and skin-care priorities.