We are the experts at keeping you warm and now we're helping you stay cool! Introducing Coolspring wearable cooling technology by Venture Heat. Featuring high powered fans designed to increase air circulation directly around your body. Wind Tech Our vest uses airflow, moving air through a proprietary 3D mesh panel to wick away sweat from the core, creating an active cooling sensation. 3D Mesh Construction Constructed with lightweight breathable polyester fabric with a honeycomb style membrane. Features: Adjustable side straps. Choose between reflective high visibility (hi vis) or a subtle gray. No Puff or Bulk vest stays slim even when fan is on. Lightweight / Portable. Benefits: Our technology allows comfort and relief for consumers in areas where air conditioning systems cannot be easily installed, such as tunnels, mining and underground construction sites. Quickly evaporate sweat and eliminate sweat odor. Reduces skin problems caused by sweat such as sweat rash. There are many cases of heatstroke in summer. Prevention of heatstroke is important for long hot summer days at the beach, gardening, at a ballpark or outdoor sports, such as fishing, climbing, camping, cycling, hiking. Ideal for users who work outdoors or in hot work environments. Staying cool and regulating body temperature is important to avoid overheating and improve work efficiency. Easy to use light and easy to carry. Unlike traditional liquid cooling garments that are bulky ,subject to leaks , have weak cooling capacity and short cooling duration. Specifications: Model: F201 Material: 100% Polyester Battery Capacity: 3.7V 5000mAh (18.5Wh) Venture Heat Unisex WindTech Single Speed Wearable Cooling Fan Vest with 3.7V Battery