Low - they typically use resistance heating elements that cannot thermally runaway because they become more resistive the hotter they get, they are manufactured from flame-retardant material, and have integral overcurrent detection and/or GFI sensors to prevent short-circuits. Since the heating elements are directly against the body, they don't get all that hot.
I would also suggest a fleece or flannel hooded-cloak-style bathrobe. These can be worn over clothes and are effectively a wearable blanket. The long cloak-length ones should cover your legs.
Low - they typically use resistance heating elements that cannot thermally runaway because they become more resistive the hotter they get, they are manufactured from flame-retardant material, and have integral overcurrent detection and/or GFI sensors to prevent short-circuits. Since the heating elements are directly against the body, they don't get all that hot.
I would also suggest a fleece or flannel hooded-cloak-style bathrobe. These can be worn over clothes and are effectively a wearable blanket. The long cloak-length ones should cover your legs.
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