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Be speedy in the Under Armour® Men's Swyft Running Sleeveless Shirt. UA ThreadborneTM Microthread fabric offers fast-drying comfort that easily stretches and prevents chafing. A textured mesh design enables ventilation, while reflective details make you easier to see in low lighting. Complete with antimicrobial technology for ultimate freshness, the UA Swyft Running Sleeveless Shirt helps you push the pace comfortably. Fitted running sleeveless shirt. UA ThreadborneTM Microthread fabric doesn't cling, prevents chafing, and stretches. Signature Moisture Transport System wicks sweat away quickly. Antimicrobial properties prevent the growth of odor-causing microbes. Textured mesh pieces deliver strategic ventilation. Reflective details for greater visibility in low light. UA logo details. Proposition 65 warning icon. WARNING: California Proposition 65. California Proposition 65. Proposition 65 warning icon. Fabric Content: 100% polyester. Color: blue