Under Armour Womens HeatGear Rib Leggings in Silica Green and White. Under Armour’s original HeatGear® fabric is super lightweight, breathable and fast drying. Crafted from 4-way stretch material that allows for optimal movement in every direction, stretchy ribbed panels to sides and lower legs, updated gusset for better range of motion, exposed elastic waistband with Under Armour wordmark detail, side drop-in pockets for your phone and infused odour control technology. Back in 1996, Under Armour invented the baselayer—and they’ve been perfecting it ever since. It took 37 prototypes and endless hours of testing to create the right light, tight layer that wicks sweat, dries fast, and keeps you cool.