STEM is a men´s seamless functional shirt.It is made from polypropylene microfibers that are antibacterial.The material moves moisture from the skin to the surface or into other layer.s of clothing.The 3D space system provides the necessary thermal comfort.Features:Printed care info (no scratchy labels).Composition:60% Polyamide, 35% Polypropylene, 5% Elastane. Compare prices from: Lasting in Men's Underwear