Ducati Smart Jacket D-air System Overview 

Georg, this is taken from dainese.com size guide for the Smart Jacket... The Smart Jacket can be worn over or under any jacket. To select your correct sizing, just follow these simple steps: If you are planning to wear the Smart Jacket under your riding jacket, just measure your chest size first wearing what you will wear when riding (base layers, t-shirt, fleece..) Please note: It is recommended that you have 5cm (2inch) of space between your base layers and jacket both on the front and on the back to leave the correct room in case of an activation. If you are planning to wear the Smart Jacket over your riding jacket, just measure your chest while wearing it. If your jacket has armour, please ensure they are in before measuring. Once you defined the correct chest sizing, just follow the sizing guide below to select the most appropriate Smart Jacket size. There is a reasonable degree of expansion in the jacket and it should fit under / over most items based on your standard chest size, the only variance could be over a big bulky touring jacket for example. Finally the vest provides 26 hours of battery life on a single charge.

The jacket does have to be sent in for repacking / recharge for a fee but much lower than buying a new jacket entirely also you would be safer in the wreck then without one 👍 The jacket does eliminate the need to wear a solid back protector.

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