X-Bionic Men's Accumulator Long Sleeve T-Shirt 94% Polyamide, 4% Elastane, 2% Polypropylene 3D BionicSphere System zones in the center of the chest and on the back provide a massive increase in surface area to effectively process excess moisture Warm or cold water machine or hand wash. Line dry. No bleaching or fabric softening agents. Made in Italy.harness the power of evaporative cooling while you are exerting yourself while at the same time providing ample loft to insulate you while at rest, avoiding the chance of over-cooling.