Features: brand new and high quality Made of high-quality polyester fiber (polyester) materials, which can not only quickly evaporate sweat, avoid sweating and odor, but also reduce the skin problems caused by sweat. There are three levels of air volume: strong, medium and weak. You can easily switch to the desired air volume. The cooling for jacket is easily to be used. Just install the fan, then it can work. (just clothes, without fan) Thanks to the ergonomic design, this cooling fan for jacket can promote sweat evaporation, improve ventilation and increase air blow to the whole body, finally effectively reduce body temperature. The best gift for outdoor-sports lovers, workers at construction fields, in factories and warehouses with high temperature or humidity. Also suitable for agriculture, leisure, outdoor garden, hiking, fishing and other difficult air conditioning environment and high temperature environment. Specifications: Material: Polyester Fiber (polyester) Color: for Grey Size: for M/L/XL/XXL(Chinese size ,follow the size chart to select please) Size: for M Length: 64.5cm/25.39'' Bust: 108cm/42.52'' Shoulder: 44.5cm/17.52'' Sleeve: 23.5cm/9.25'' Size: L Length: 66.5cm/26.18'' Bust: 112cm/44.09'' Shoulder: 46cm/18.11'' Sleeve: 24cm/9.45'' Size: XL Length: 68.5cm/26.97'' Bust: 116cm/45.67'' Shoulder: 47.5cm/18.70'' Sleeve: 24.5cm/9.65'' Size: 2XL Length: 70.5cm/27.76'' Bust: 120cm/47.24'' Shoulder: 49cm/19.29'' Sleeve: 25cm/9.84'' Package Includes: 1x Cooling for Jacket note: 1.Please allow 1-3cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.