The CoolSwitch Thermocline Long-Sleeve Crew Tee boasts Under Armour's revolutionary CoolSwitch technology, which helps cool your body and skin so you can perform longer. Rugged 90% polyester, 10% elastane HeatGear fabric has built-in UPF 30+ sun protection to shield your skin against harmful UV rays. ArmourBlock technology helps neutralize odor-causing microbes so you stay smelling fresh. Strategic ventilation at the under-sleeves and side panels lets air circulate to further keep you cool in the heat. The low-profile, crew-neck collar ensures a snug, but not-too-tight fit. A "UA" fish hooks logo at the center front lends unmistakable Under Armour styling. Loose fit. Imported.