For the ultimate in discreet, high-tech protection and comfort, check out the all-new SAS-TEC CE 1 Armor. The very flexible visco-elastic soft foam protector's clever design allows it to deliver exceptional damping performance even at low temperatures, with a residual force of about 25 kN (standard, level 1: 35 kN). The SAS-TEC CE 1 Flex Armor is nearly undetectable beneath clothes because to its very flat design.Most people fit into one size.