Research proves that our bodies release perspiration even when we are not engaged in strenuous activities. With long work hours, you need to know you are protected. The carrier liners of all SAVVY vests are protected with A.M.Y. because microorganisms thrive in moist conditions. A.M.Y stands for Anti-Microbial Yarn. When you perspire, bacteria builds on the skin. The anti-microbial effect of A.M.Y. reduces bacteria, mold and fungi growth on the garments that touch your skin. This protection lasts even between washings.