Men's t-shirt with built-in chest and back guards Foc BASEFRAME PRO is made from smart D3O foam that absorbs impact. Impact absorbing foam provides full coverage and unrestricted range of motion. Body heat activates (softens) the foam to conform to body. CE EN 1621-1 Level 1 certificate for high and low temperatures. Moisture wicking, elastic, mesh material provides improved breathability. The t-shirt also come with built-in side guards.