Cool.Q ZERO active cooling technology makes the Way2Cool Short-Sleeve Tee the most advanced running top on the planet! Mountain Hardwear's exclusive Cool.Q ZERO technology accelerates the wicking process and helps your body minimize heat and maximize energy. MicroClimate Zoning is specifically engineered to provide warmth where you want it and ventilation where you need it. Rigorously athlete-tested for premium performance, the Way2Cool Tank Top dries quickly for added comfort and is antimicrobial-treated to help control odors. Body: 100% polyester mesh-knit jersey fabric. Panels: 92% polyester, 8% elastane Stretch Softie jersey fabric. Active fit. Imported.