The materials used in large sex dolls significantly influence their realism, durability, and maintenance. The most common options include silicone and thermoplastic elastomer (TPE). Silicone is prized for its realistic feel, high heat resistance, and hypoallergenic properties. It maintains shape well over time and is generally easy to clean, making it a popular choice for longevity. TPE, on the other hand, offers a softer, more flexible texture that closely mimics human skin, often at a lower cost. However, TPE may be more susceptible to tearing and staining, requiring careful handling and regular maintenance. Some manufacturers use a combination of materials to optimize realism and durability. Other considerations include internal framework options, such as metal skeletons for poseability, and surface treatments that affect friction and cleaning. Understanding these differences helps buyers select a doll that aligns with their preferences and lifestyle. Ultimately, balancing cost, feel, and longevity is key to making an informed choice that ensures satisfaction and safety.