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