EVA (Ethylene-vinyl acetate) is the most common for puzzle mats due to its high durability and cost-effectiveness, but it requires strict monitoring of formamide levels. XPE (Cross-linked polyethylene) is increasingly popular for folding mats because it is hypoallergenic, waterproof, and provides superior shock absorption. PVC (Polyvinyl chloride) offers the highest durability and a 'memory foam' feel, making it ideal for premium, long-term residential use, though it is significantly heavier and more expensive to ship.