Behind the lifelike exterior of a Czech sex doll lies a functional structure designed for realism and safety. The outer skin is typically silicone or thermoplastic elastomer (TPE), stretched over an internal framework. Most dolls feature a lightweight articulated skeleton, often made of stainless steel or sturdy polymer, with joints at the neck, shoulders, elbows, wrists, hips, knees, and ankles. This supports natural posing while maintaining resilience under regular use.
Inside, the torso houses the main supporting cavity and internal components. A pelvis or chest cavity may contain additional foam padding to provide shape and softness, while a central spine-like column gives torso stability. Hinged or ball-and-socket joints allow 360-degree movement in key areas, helping achieve a variety of positions.
The head is typically mounted on a flexible neck hinge, letting the face tilt and turn. Some models integrate internal wiring for features like lighting or sound, though many focus on mechanical poseability and tactile realism. The hands and feet are often detachable for easier cleaning and storage, and nails may be sculpted or attached as separate components for durability.
Hygiene and maintenance are important parts of the anatomy story. Removable cavities or easy-to-clean surfaces help with washing after use, and materials are chosen for resistance to moisture and cleaning agents. Overall, the internal construction aims to balance realism, weight, and durability, enabling lifelike posing while keeping maintenance manageable for owners.