Is it hot to wear down jacket in 40 degrees summer?

In the summer of 40 degrees, it will be very hot to wear down jacket, because down jacket is a kind of clothing with good warmth. It is usually made of materials with good thermal insulation, which can prevent external heat from entering and keep internal heat from being lost. Therefore, in hot weather, wearing down jacket will make your body temperature rise continuously and make you feel very hot.

In addition, in hot weather, the body's natural regulation function will promote the body to sweat, thus lowering the body temperature, while wearing down jacket will also prevent the body from reducing the body surface temperature through perspiration and evaporation.