275 grams of cotton is half a pound weight, made into clothes, in general, minus 3 or 4 degrees is no problem.
If the cotton filling amount is 275g, it is generally the kind of light down or down vest, which has a certain thermal effect. With sweaters, thermal underwear, etc. wear is able to withstand almost minus two or three degrees, and then cold is not good. The usual down jacket we buy is generally filled in 180-250g, 600-700 fluffy, if it is to buy down jacket, it is recommended to buy in accordance with this standard; The higher the value, the better the thermal performance.