Neoprene sponge rubber is classified primarily by its cellular architecture and reinforcement strategy, which together determine mechanical performance, chemical resistance, and cost profile. The closed‑cell variant encapsulates gas bubbles within a continuous polymer matrix, delivering high compressive strength, low water absorption, and superior thermal insulation; it accounts for the majority share of volume because of its suitability for sealing and cushioning. The open‑cell form features interconnected pores, offering greater flexibility, breathability, and acoustic damping, thus finding niche use in filtration and medical padding despite a lower price point. Reinforced neoprene incorporates fabric or fiber layers—often polyester, nylon, or aramid—within the rubber slab, markedly improving tensile strength and dimensional stability for load‑bearing components. Finally, laminated constructions combine a neoprene core with protective skins such as PVC or TPU, extending service life under abrasive or UV‑exposed conditions. Each type contributes distinct value to the overall market size, with closed‑cell driving bulk volume, while reinforced and laminated grades capture higher‑margin segments where performance specifications outweigh material cost.