The Nike Boys' Pro Core Short-Sleeve Training Shirt is made of 84% polyester and 16% spandex plain-jersey material with Dri-FIT fabric technology that provides ventilation and moisture management. The strategically placed seams ensure comfort and freedom of movement, and the shirt's crew neck with contrast-colored tipping combine comfort with a touch of style. Short sleeves. Swoosh design trademark at the upper left chest. Jock tag at the lower left hem.