High Quality Content by WIKIPEDIA articles! The A7L Apollo Skylab spacesuit is the primary pressure suit worn by NASA astronauts for Project Apollo, the three manned Skylab flights, and the Apollo-Soyuz Test Project between 1968 and the termination of the Apollo program in 1975. The "A7L" designation is used by NASA as the seventh Apollo spacesuit designed and built by ILC Dover. The A7L is a design evolution of ILC`s A5L and A6L. The A5L was the initial design. The A6L introduced the integrated thermal and micrometeroid cover layer. After the AS-204 spacecraft fire, the suit was upgraded to be fire-resistant and given the designation A7L.