Under Armour HeatGear Mirage 8 Inch Running Shorts - AW16 Signature Moisture Transport System - Wicks sweat away from the body. 4-Way Stretch Fabrication - Improves mobility, while helping to maintain shape. Ultra-Lightweight, Smooth Woven Fabric - Delivers superior mobility. Regular Fit - A slimmer athletic cut that delivers better mobility by eliminating the bulk of extra fabric. Notch at Hem - Allows for better lateral movement.