An evolved version of Gemini suits, the Apollo spacesuit had two models: the A7L for missions 7 through 14 and the A7LB for missions 15 through 17 (modified for ease of use with the Lunar Roving Vehicle). Designed for the harsh environment of the lunar surface, safety and mobility were key factors.

All previous American suits received life support from the spacecraft via long umbilical hoses that restricted free movement. The Apollo suits added a self-contained life support backpack and a pair of lunar overshoes to provide traction on the lunar surface. This training A7LB spacesuit also features a red stripe on each arm and leg, indicating it was for the EVA Commander. The use of the red stripe began with the Apollo 13 mission, allowing for easy identification of astronauts in photos and videos.