Description 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.PRODUCT DETAILS:3 oz lightweight technical knit Greater Arm Mobility for freedom of movement ClimateTEK for dynamic and temperature regulated cooling FreshTEK sustainable odor-resistance Ribbed collar and cuffs Drop tail hem Breathable mesh side Arm and back panels Patch pocket Stain Release 100% Polyester