• The most-advanced XC4® yet!
• Exclusive breathable, waterproof, construction and materials.
• Axis Chassis™ System offers optimal support and stability. 
• Smart Degree Technology® temperature-regulating interior polymers activate at both hot and cold temperatures, so your feet feel just-right all day.
• XC Foam® delivers superior cushioning, lightweight comfort.
• Dual-width footbed can be easily removed to accommodate your own orthotic or wide foot.
• Removable multi-density footbed with memory-foam cushioning and arch support.