The Crowe value is 5. According to official website of Chinese Physical Society, Crowe value of 5 can keep warm, naked Crowe value is equal to 0, Crowe value 1 is equivalent to resisting the cold of 4.4 degrees Celsius when sitting, and Crowe value of 5 is 22 degrees Celsius, which means that it can not be cold at about MINUS 3 degrees only when wearing a sitting suit. Crowe value is an engineering unit to describe the thermal insulation and warmth retention performance of clothing or fabric, that is, "thermal resistance"