Under Armour Spine Gameday Top - Men's Under Armour's Spine Gameday Top is built to bring a light, soft feel to the layer under your uniform. The HeatGear® performance fabrics work to remove heat and sweat, and are at their best in weather from 75-100º. A full mesh panel in the back helps add breathability as well. Extra length was added to the body to ensure that the top stays tucked in as you move. Spine-inspired embossing on the sleeves hooks this top with the rest of the UA Baseball gear. Fitted. 91% polyester/9% spandex. Imported.