>>2568233I didn't use the sleeping mat my first few years as a grunt. Eventually got fucking tired of my shoulders and ass being cold in the morning, started using the issued sleeping mat (puss pad, as we called it), and never woke up even remotely cold ever again.
The MSS, the M81 woodland one in your pic, was issued with a roll-up EVA mat like pic related, though the shade of green varied depending on the year. The newer IMSS uses an inflatable mat.