PKI 9740 is designed for law enforcement and security personnel. It is a concealed body protector and ideal to wear under normal street clothes for extended periods of time, even in hotter climates. After all, this T-shirt is not only waterproof and heat resistant, but also meets the ballistic level of NIJ IIIA. PKI 9740 is made of special stretchable material and conforms to the body, which means PKI 9740 is comfortable to wear.