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For heatstroke prevention. For work in workshops without air conditioning, farming work, leisure and so on. 100% Cotton N Coolwear Jet Spacer creates a passage of wind on the shoulders and back, allowing the wind to blow through any position. The 3D eri effect gives you a new feeling of coolness. Short sleeve The top fan is hard to hit with chair backrest or waist belt for full harnesses. Material: 100% Cotton Can be used with a set of batteries, fans, and cables sold separately.