Iconic training shoes redesigned for optimal comfort/Happy Nanoversary! To celebrate the 15th anniversary of the iconic training shoe, Reebok set out to make the most comfortable version yet. These women's shoes have a dual-density midsole with firmer foam in the heel for stability and more responsive foam in the forefoot for comfort while running and jumping. A plush collar keeps the foot locked down and eliminates distractions. A decoupled, Metasplit outsole enhances runnability.