Filling difference: down vest is filled with down, and cotton vest is mainly filled with cotton. Down is one of the best thermal insulation materials at present, with excellent thermal insulation performance, which can effectively block the invasion of cold air and keep the body warm. However, the thermal insulation performance of cotton is relatively poor, which can not provide the same degree of thermal insulation effect.

Warm-keeping performance: The down vest is made of bird feathers, and the tiny down in the feathers can form an air layer, effectively blocking the entry of cold air from the outside, while keeping the body's heat from being easily lost. Mainly because its filler is cotton, compared with the filler used in down vest, such as duck down or goose down, its thermal insulation performance is worse and it cannot provide the same degree of thermal insulation effect.