Final answer:
The maximum water temperature for washing the ABA cover should protect the material while keeping the inside at a suitable temperature close to skin temperature, even if the ambient air temperature is -10°C. The exact maximum temperature is not provided, but practical design would ensure comfort and safety of the person wearing the armor.
Step-by-step explanation:
The maximum temperature for washing the ABA (Adaptive Body Armor) cover should be such that it prevents damage to the material and ensures it does not affect its protective properties. The maximum water temperature is not specified in the question, but the statement provided indicates that the inside surface of clothing will be near skin temperature, and the outside will be near ambient temperature. If the ambient air temperature is -10°C, the maximum air temperature to maintain the inside at skin temperature would be comfortable enough to prevent hypothermia or overcooling, generally warmer than -10°C but not so high as to cause overheating. It seems reasonable to impose a condition that keeps the inside of the armor at a temperature that is neither too cold that it induces hypothermia nor too hot that it causes the wearer to overheat.