Under Armour 1257471 HeatGear Armour Long Sleeve Compression Shirt Black/Steel S This lightweight compression shirt features breathable mesh underarm panels and HeatGear fabric that wicks away moisture. Made of polyester and elastane. Soft, lightweight HeatGear knit is anti-odor, quick drying and moisture-wicking to keep you cool and dry. Crew neckline has mesh panel on back of neck for increased airflow to help lower temperature. Long raglan sleeves. Under Armour logo at center of chest and top center back. Underarm breathable mesh panels. Flat-lock stitching for non-chafe comfort. Contrast stitching gives a cool, sporty look. Comfortable 4-way stretch. UPF 30+ sun protection. Tagless for comfort