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The best baselayer just got better. The Under Armour® Men's HeatGear® Sonic Fitted Sleeveless Shirt is lighter and softer than ever. Comfortable enough for all-day wear, this top is constructed with flatlock seams to prevent chafing, moisture-wicking properties to keep you dry, and 4-Way Stretch fabrication for a full range of motion. Take your performance to the next level in the UA HeatGear® Sonic Sleeveless Shirt.