Modeka Veo Air オートバイのジャケット

In the description of the product it is mentioned that it comes with back protector, however the jacket arrived without it.

Jacket is on wider side. I am 191cm 107kg 117cm chest. Upper part fits perfectly. Just what is missing is some kind of adjustment around waist as there jacket is to wide for me, even I have little bit of belly. So in general feeling is that around waist is bigger than on the photo. Jacket feels plastic and hot but when you move then all air is passing through. Protection in on lower side and without protection for back. I ordered size 4XL and back protection is size M 1/12. I replaced shoulders and elbow protection with L2 D30 pads and backorder SAS-TEC 1/12 size as it is written inside jacket. Once I get it will post you is this right or not as seams to be way too small. I was just following instruction.