The Types dimension of the market taxonomy classifies shrink sleeves by material composition, each influencing cost structure and performance. PVC (polyvinyl chloride) remains the dominant substrate, prized for its clarity, flexibility and low‑cost production, supporting the bulk of food‑grade applications. PET (polyethylene terephthalate) offers superior barrier properties and recyclability, gaining traction in premium beverage and personal‑care segments despite a higher price point. Polyolefin films, including BOPP and LDPE blends, provide enhanced heat‑shrink characteristics and resistance to solvents, making them suitable for household and automotive uses. Biodegradable or compostable films, derived from PLA or starch, are emerging in niche markets driven by sustainability mandates, though their current share is modest. Multi‑layer composites combine two or more polymers to balance clarity, strength and barrier performance, often employed in pharmaceutical packaging where regulatory compliance is stringent. The relative adoption of these material types shapes the overall market composition, with PVC leading, PET and polyolefin expanding, and eco‑focused variants poised for incremental growth.