Stalcraft Wiki: Tonga Jumpsuit

In-game description (EXBO)

The early version of Uranus, released by Research Institute 7 shortly before work began on the AH series. Although the anomalous protection metrics of Tonga do not reach the best in its class, the suit more than compensates for its shortcomings with high-quality servomotors and a reliable life support system, which were the focus during the development of the suit.

Quoted from the game's own text in EXBO's public game data. Not written by STALCRAFT Meta.