The arm units come in various sizes so that the EMU can be fitted to different astronauts. The arm units fit into the HUT by quick connect rings. Gloves Like the arm units, gloves have wrist bearings for easy movement. They fit into the arms by quick-connect rings. The gloves have rubberized fingertips to help astronauts grip things.
Astronauts also wear fine-fabric gloves inside the outer glove units for comfort.
The outer gloves have loops on them to tether tools. The helmet is padded in the rear for comfort, because the helmet remains fixed rather than rotating with the astronaut's head. It has a purge valve to remove carbon dioxide if the backup oxygen supply must be used. In the helmet, oxygen flows from behind the astronaut's head, over the head and down his or her face. The inside of the helmet is treated with an anti-fog compound prior to the spacewalk.