An (
Integrated)
Thermal Micrometeoroid Garment (
TMG or
ITMG) is the outer layer of a
space suit. The TMG has three functions: to insulate the suit occupant and prevent heat loss, to shield the occupant from harmful
solar radiation, and to protect the astronaut from
micrometeoroids and other
orbital debris, which could puncture the suit and depressurize it.