Not sure what type of chemical scent it adds in, but the body washer gives a very strong, and unpleasant smell. Im already anticipating arguing about wearing these when the weather gets chillier. I only have 3 of the 2 orders full left, so there isnt even anything to return. It might have something to do with how the coils are placed but I am very happy with it. Also, as others have mentioned, it is also annoying that this thing needs 3 plugs - a mic 3. A Sena rep confirmed that the bluetooth module from the 30K is actually the same module as the SMH10 so you loose the audio multitasking with a standard bluetooth intercom connection. It?s like looking at a Toyota Corrolla and knowing it has the internals of a Porsche. I tried returning but it says the products cant be returned. Lots of room for plates. Theres a small gap in front of my toes but it makes up for it when I run.