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Under Armour Boys' Size Chart The shirt that started the legacy. All Under Armour® Apparel features a tagless design or tear-away tag with no left-over pieces. Lightweight UA Tech™ fabric with an ultrasoft, natural feel for unrivaled comfort. Signature Moisture Transport System wicks sweat away from the body. Anti-odor technology prevents the growth of odor-causing microbes. Smooth, chafe-free flatlock seam construction. Full, loose fit for enhanced range of motion & breathable comfort no matter where your workout takes you. 100% polyester. Machine wash cold, tumble dry low. Imported. Measurements: Length: 21 in Product measurements were taken using size MD (10-12 Big Kids). Please note that measurements may vary by size.