Free-size vest with mesh material, featuring cooling and heating functions. I recently purchased this and used the instant cooling/heating free-size vest several times. It seems useful not only in summer but also in winter. Workman Model Name: WindCore ICE×HEATER Item No.: WZ-2 Includes a 3.7V 10,000mAh battery Instant cooling up to approximately 10°C in 1 second Heating up to 43°C Instruction manual included. Price negotiation not accepted. Retail price: 19,800 yen - Brand: WindCore - Model Name: ICE×HEATER - Size: Free size - Accessories: USB charger - Material: Mesh material Thank you for viewing.