Thermal Micrometeoroid Garment
（重定向自MMOD）
![](/Images/godic/202501/27/Tmg0436.gif")
![Micrometeoroid impacts in Beta cloth](/Images/godic/202501/27/Beta_cloth_penetration0436.jpg")
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.