The softness and flexibility of sex dolls greatly influence comfort and realism. Softer dolls, often made from high-grade silicone or TPE, provide a plush, skin-like feel that mimics human softness, making prolonged sessions more pleasant. These materials usually feature layered textures to enhance realism, offering a gentle touch that appeals to tactile senses. Flexibility is achieved through articulated joints and internal skeletons that allow natural movement and positioning without stiffness. More flexible dolls enable a wider range of poses and comfort during extended use, reducing strain on both the user and the doll. While softer models tend to be more comfortable, they may require careful handling to prevent damage. Conversely, dolls with a firmer structure might offer better support but may sacrifice some softness. The ideal balance depends on individual preferences, but advanced models often combine both softness and flexibility to maximize comfort, realism, and durability for an enjoyable experience.