They’re basically oversized gardening aprons with large pockets front and back that you can plop babies into so each nurse can carry up to four of them to safety.
I’m still wondering though - how long can a surgical operation be interrupted? Are surgeons and nurses expected to rush back to resume surgery as soon as possible, after an earthquake/tornado/fire/shooting/attack, given that the patient will soon awake from the anesthesia and still is lying on the bed sliced open?
Theatres are separate from the rest of the building and so long as the fire isn’t actually in that area, they will have at least half and probably an hour to make safe and bail out. Chances are that the situation will be under control long before that.