Socks Under Armour Youth Heatgear Crew-Blk. Socks Under Armour Youth Heatgear Crew-Blk. Technology: HeatGear - Unique highly breathable material, wicking sweat super fast. It keeps you drier, lighter and cooler than ever. Garments made of this material are designed for temperatures between +23°C and +37°C. Children's high socks made of original Heatgear material. Support for arching for lower leg fatigue. Strategically placed damping protects the most strained parts of the foot. In the construction used mesh panels provide excellent ventilation. The package contains 3 pairs of socks. Material: 97% Polyester, 3% Elastane