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 is pleasant to the touch. We've made it easy for you, so you can machine wash your shoes to keep them fresh and clean. Adjustable Heel: For quick transition from training mode to recovery mode.