Unlike the current suit, which were based on the G3C suit worn by the Gemini 3 crew and later adapted for use by the U.S. Air Force for high-altitude operations, the "Configuration One" suit will feature a closed-loop environmental system (similar to that of a rebreather the ACES suit uses a SCUBA-like open-loop system, limiting its operations above 100000 feet ), new bearings in the shoulder, elbows, wrists, hip, and knees, and a full-pressure helmet with a swivel faceplate (closed by a mechanical seal) and incorporating a sunshade.