A sex doll is normally supplied with a soft head, allowing you to squeeze the cheeks and easily press in certain areas for a playful function.
When you choose implanted hair, a hard head is automatically used. This hard skull is necessary to keep the implanted hair securely in place so it does not come loose quickly.
A hard head (which is strictly necessary with implanted hair) provides maximum durability and is hard everywhere, just like your own skull. With a hard head, however, you can upgrade and choose soft cheeks, giving you a more realistic head with softer areas.
