Vented bio-foam and air mesh chassis are paired to an articulating injection molded shell with airflow channels to keep you cool and comfortable D3O viper chest and back C.E. certified impact protector provide industry leading impact absorption Elastic hook and loop straps help ensure a snug fit over multiple body sizes, while the low profile form factor fits easily under most jackets Adjustable fit Tested and certified to EN 1621-3 2018 Class C, level 1 standard Stealth Black.