Under Armour Junior Assert III Running Shoes mesh synthetic rubber sole Form Fitting Upper - Constructed from a breathable mesh membrane and straddled by a series of overlays to deliver comfort, flexibility and stability in equal measure. Unique Heel Insert - Bears the brunt of the initial heelstrike phase of the gait cycle. Low Profile Midsole - Lends the shoe its notable cushioning ability whilst also maximising the efficiency of every stride. Carbon Rubber - Reinforces areas of the outsole that are particularly prone to wear. High-Abrasion Foam - Covers areas with less tread to ensure that as much of the outsole contacts the ground as possible, thereby facilitating a stable, reliable ride.