Women's UA Catalyst Shortsleeve T Tops by Under Armour Performance Technology: Under Armour® HeatGear® --For when it's hot. HeatGear® technology wicks perspiration off your skin, rather than absorbing it. It's engineered with UA's Moisture Transport System to deliver core temperature regulation and maximum breathability.Anti-Microbial--Anti-microbial treatments provide permanent odor protection by inhibiting the growth of bacteria and mildew in the fabric.UV Protection--Fabric is treated to block UV (ultraviolet) radiation from the sun, helping to prevent sunburn.Ventilation--Mesh or breathable fabric inserts in high heat zones allow sweat to evaporate and cool air to circulate.Raglan Sleeves--Sleeves are attached with a diagonal seam that runs from the underarm to the neckline, allowing freedom of movement and preventing skin irritation. Built for cross training. Semi-fitted to lay