Reebok TrainTone Slimm Womens Gym Training Shoes Synthetic TrainTone technology is designed to improve your workout and allow you to get the best rewards by toning and strengthening key leg and bum muscles while training Breathable mesh upper for comfort and ventilation, with synthetic overlays for support SmoothFit upper ensures a comfortable and irritation-free fit Forefoot flex grooves for enhanced flexibility Balance pods built in under the heel and middle creates natural instability in every step to force your muscles to work harder and encourage toning