The Activate U-Throat features:

• Our lightest, most breathable construction yet.
• In the softest perforated nubuck or full-grain leather, plus a new extra-breathable leather thats specially processed to optimize air flow, so its twice as breathable as traditional leather.
• High-rebound ventilated EVA sole maximizes the flexible comfort.
• Temperature-adjusting J&M Smart Degree Technology activates at both hot and cold temperatures, maintaining a higher degree of comfort, so your feet feel just-right all day long.
• Removable, dual-density cushioned insole.
• Rubber heel for durability and improved traction.