Under Armour Heatgear Sonic Fitted 4" Shorts - Boys' Grade SchoolThe Under Armour HeatGear Sonic Fitted Short features the signature moisture transport system that wicks sweat away and dries quickly leaving your skin cool and comfortable. The lightweight, four-way stretch fabric design offers flexibility. Anti-odor technology provides long-lasting freshness. HeatGear® is best for weather between 75 and 100 degrees. 84% polyester/16% spandex. Imported.