The PSEMU¹ is the EVA² suit used on the Ceres program missions. These spacesuits will be optimized for the vastly different atmospheric conditions the Ceres crew will endure.
Mobility and Long-range Life Support System
Astronauts will have to be able to walk around freely and do so for extended periods of time. Without use of tethers to the spacecraft.
The design for the PSEMU is now in phase A.
¹PSEMU: Planetary Surface Exploration Mobility Unit
²EVA: Extra Vehicular Activity