Powerful like the jets! The Under Armour Jet 21 wraps your kids' little feet in a lightweight and responsive feel with its cushioned EVA midsole. Equip your feisty little ones with the thrust and propulsion they need with the Under Armour Jet 21. Under Armour Jet 21 features: Synthetic upper gives lightweight comfort, durability, and breathability. Breathable mesh tongue adds strategic ventilation. Plush ankle collar foam brings in added comfort and support. EVA outsole offers flexibility and durability.