Do I need to wear a back protector when I use the Smart Jacket?

Smart Jacket is the maximum freedom of protection. Its D-air® airbag system offers the same amount of back protection as seven back protectors and covers a wider surface than a back protector, without the bulk or stiffness of a hardshell protector. However, for those who prefer to wear an active protector like a back protector, there are no contradictions to wearing it together with the Smart Jacket.