Abstract: A life jacket in including impact absorption materials on both sides of a hard protection material in which a high-impact fiber cloth is incorporated buoyant material on at least one impact absorption material provides buoyancy. The jacket includes front and back bodies of which the back body is longer than the front body and they are parted in the middle at the shoulder region, such that the interior material takes the form of a waist coat. By extending an upper portion of the hard protection material of the back body along a neck region of the front and back bodies, a head region retroversion protective portion is configured. Front and back bodies of the life jacket are fastened to the user by at least one belt.

Abstract: A life jacket in which impact absorption materials are provided on both of inner and outer sides of a hard protection material in which a high-intensity fiber cloth such as a textile fabric or a knit fabric made of aramid fiber is incorporated. An interior material provided with a floating material on the outside of one impact absorption material is packaged in cortexes of front and back bodies which are bonded in such a manner that the back body is formed to be longer than the front body and they are parted in the middle at a shoulder region, such that the interior material substantially takes the form of a waistcoat. By extending an upper portion of said hard protection material of the back body of the life jacket along a neck region of the front and back bodies, a head region retroversion protective portion is configured and the front and back bodies of the life jacket are fastened by at least one belt upon wearing the life jacket.