The spacesuits are mandatory for the Captains to survive on the Planet of the Pikmin, and are also their main defense against hazards and enemy attacks. The suits include a completely clear helmet that surrounds their entire head, and has an antenna with a light on top. There is a pack on the back which presumably contains the life-support system. Each captain has a differently sized and colored suit. In Pikmin 1, Olimar's suit can only function for 30 days before the life-support batteries fail.
The suits will spark when damage is taken from an enemy or hazard, and the health meter in the bottom-left corner of the screen will decrease. After the meter is reduced to less than half, it will start to flash and a beeping noise will be heard. Any damage taken can be regenerated by going to the next morning, finishing a cave, or by standing in the light of the Dolphin and pressing A in the first game. This will not work with the Ship in Pikmin 2, so the player must survive until the start of the next day. However, if only one captain should be damaged too much, the player can continue the day with the other captain.
When a captain whistles, the antenna will emit rings of light which spread out at the point where the pointer is. Each captain's whistle has a different sound.In Pikmin 3, the spacesuits worn by Captain A, B, and C are nearly identical to Olimar's, but feature small pea whistles attached to the front of their helmet. The area below the collar is also colored the captains' main color.