Molded, contour design. Lightweight-less than 1 1/2 " thick and weighs only a few ounces which make it less bulky to allow for excellent mobility. Made of hard foam divided into sections to maximize impact absorption. Intended to reduce the risk and severity of accidental injury and to protect mid section and chest areas during supervised, no contact or light contact martial arts sparring. Four point elastic harness straps plus adjustable nylon strap around waist allow for secure comfortable fit.