From the moment they arrive at MDRS, crews enter a "living on Mars" simulation. Crew members must wear an analogue space suit simulator or a "sim suit" when completing tasks outside the Habitat (HAB) to simulate the protection they would need from the in reality very harsh Martian environment. Complete analogue space suit simulators include a helmet, jumpsuit, boots, gators, gloves, an air supply pack, Platypus water pack, and a radio.