Soft skin materials are fundamental in the design of realistic sex dolls, greatly enhancing tactile experience and immersion. Manufacturers typically use high-grade silicone or thermoplastic elastomers (TPE) that replicate the softness, elasticity, and warmth of human skin. Silicone offers durability, resistance to wear, and a more lifelike feel, while TPE provides a softer, more flexible surface that closely mimics human tissue. These materials are often infused with special textures or layered with detailed skin patterns to add realism. The choice of skin material also impacts cleaning and maintenance procedures, with some options being more resistant to damage or staining. Advances in material technology have led to the development of ultra-soft, stretchable skins that respond to touch with realistic feedback. The use of soft skin materials not only improves the sensory experience but also contributes to the overall aesthetic appeal, making the dolls more convincing and comfortable to use. Continuous research aims to develop even more realistic, safe, and durable materials for future designs.