Product details:

Item 25-3821 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.