REV'IT! Avertum Street Tech-Air AirbagDescription Designed with state of the art airbag technology, our Avertum Tech Air airbag is based around three accelerometers and three gyroscopes, that are integrated into a beautifully subtle and ergonomically fitting vest. With the vest made to be worn under a jacket, its lack of a collar means the Avertum disappears almost entirely under whatever garment you choose to wear over it. Technical inside, clear and clean outside Assembled from durable