Polarmax® Men’s Micro H1 LS Crew with Acclimate® AC and Insect Shield® is an ultra-innovative high-performance crew built with both Acclimate® AC Advanced Cooling and Insect Shield® technology. The Acclimate® AC, activated by the moisture from your sweat, will keep you significantly cooler to the touch while the Insect Shield® will keep any unwanted pesky bugs at bay! Insect Shield® will kick any mosquitoes, ticks, ants, flies, chiggers, and midges to the curb! Enhanced with Polarmax® Acclimate® Dry moisture-wicking/quick drying, Ag47™ antimicrobial protection and a UPF Sun Protection rating of 39+. Stay out longer with THE best outdoor adventure shirt around! Relaxed Fitting. Made in the USA!