Sweaters will become loose and fat after wearing for a long time, which will not fit and affect the appearance. In order to restore the original state, the sweater can be ironed with hot water, and the water temperature is preferably between 70℃ and 80℃. If the water temperature is too high, the sweater will shrink too small. For example, if the cuff or hem of a sweater loses elasticity, it can be soaked in hot water at 40 ~ 50℃. 1 ~ 2.