I/Z FRONTIER Cool Vest with a maximum cooling effect of -25°C, usable for approximately 3.9 hours, and featuring 4-level temperature adjustment. 6-piece type. - Model Name: I/Z FRONTIER - Cooling Temperature: Maximum -25°C - Usage Time: Approximately 3.9 hours - Temperature Adjustment Levels: 4 levels - Weight: Lightweight Used twice, but no longer needed, so I'm selling it. No box included. Size: XL Cancellations are not accepted. Thank you.