UA FLOW: Unparalleled comfort, ground contact and traction, all without creaking. Breathable upper: Reinforced support material with designed ventilation. BOA Fit System: Personalized fit. Internal foam padding from heel to toe with Iso-Chill technology that feels good to the touch. We've made it easy for you, so you can wash your shoes in the washing machine to keep them fresh and clean. Customizable heel: For a quick transition from training mode to recovery mode.