Zoot Sports Men's Run Surfside Sleeveless 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