Made for your most dynamic aerobic activity, this technical shirt beats the heat with Columbia's sweat-activated cooling technology.Ultra-wicking, cooling fabric manages sweat by reacting with your sweat to lower the material’s temperature.Features: Omni-Freeze ZERO™ sweat-activated super cooling Omni-Wick™ Modern Classic Fit Comfort stretch This product incorporates an antimicrobial treatment intended to protect the product from bacterial growth. The active biocidal substance is: pyrithione zinc. Center Back Length: 28.0" Uses: Water, Hiking Composition: 100% polyester ZERO interlockColumbia Zero Rules Short Sleeve Tech Tee Black 010 1533313