The Huygens probe measured 2.7 metres across and was built like a shellfish: a hard shell to protect a delicate interior from extreme temperatures experienced during the descent through the atmosphere.
It consisted of two parts: the Entry Assembly Module and the Descent Module.
The Entry Assembly Module carried the equipment to control Huygens after the separation from Cassini, and had a shield that acted as a brake and as thermal protection.
The Descent Module contains the scientific instruments. The probe will use three different parachutes in sequence during the descent.