Rebar™ Heat Fighter T-shirts are 100% dedicated to your comfort with a built-in intelligent cooling system that works with your body temperature and lightweight technical knit fabric that delivers optimal breathability. Rebar Heat Fighter T-Shirt Product Features : Greater Arm Mobility™ helps extend arm and shoulder range-of-motion so you can move freelyClimateTEK™ dynamically responds to your body temperature to keep you cool when things heat upFreshTEK™ odor control helps keep you feeling fresh through long hours of wearStain-repellent finish helps keep fabric looking clean and easy to maintain through repeated wear, Ribbed collar and cuffsLong back hem helps provide extra coverage while you bend, stretch, or reach, Patch pocket Women's Rebar Heat Fighter T-Shirt in Navy, Size: XS by Ariat