When sourcing men's slippers, the choice of material directly impacts durability and comfort. For the upper, prioritize genuine leather or high-grade microfiber for a premium look, or breathable cotton and linen for indoor summer use. For the lining, natural wool or faux shearling is essential for winter thermal retention. Most importantly, the outsole should be made of TPR (Thermoplastic Rubber) or EVA, which provides anti-slip properties, lightweight cushioning, and wear resistance suitable for both indoor and light outdoor use.