Polyester/Need connect power bank to work,Power bank sold separately CREATIVE COOLING VEST: Come with removable fan that moves fresh air along the back and shoulder, sweat evaporates instantaneously that make you feel cooling in hot day. cool vest that manages heat stress. You can feel very comfortable at work, avoid heavy sweating and heat stroke. 3 FAN SPEEDS SETTINGS: Evaporative cooling vest has three air flow modes so you can adjust the air flow to the work conditions. 9 blades design support large air volume. Three levels of air volume (strong, medium, and weak).5V,10000 mAh USB battery can provide a runtime of 13 hours (low), 8.8 hours (medium), 6.7 hours (max). CE/FCC/PSE/ROHS certification support.
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