Zoot Sports Men's Run Surfside Tee Body: 100% Polyester With Icefil Technology, 129Gm2, Mesh: 100% Polyester, 75Gm2 Imported Reflective details for visibility in low-light conditions Ultra-light melange knit construction with Icefil uses Xylitol to keep you cool and comfortable Mesh back inset for enhanced ventilation and cooling Flat lock stitch construction ensures next-to-skin comfort and minimizes chafing Reflective details for visibility in low-light conditions