In this step, we'll assign a material that simulates the thermo-physical properties of a human body to our occupant. The default installed material database does not contain an actual "human body" material, so we'll use silicon as a close analog. A more rigorous approach would be to create a material with the actual properties of a human body, and add it to a custom material database.
1. Select the occupant by left clicking on him.
2. Click Edit from the Materials context panel:
3. On the Materials quick edit dialog, select the material type:
4. From the Name menu, select Human
5. Click Apply.
What it should look like...
6. To verify that the Silicon material is properly assigned, check the Design Study Bar and the part coloring: