Can I also detach the SIP bumpers of this seat?

Yes, the SIP bumpers can be detached from this seat, allowing you to fit up to three people in one row. When installing this seat on an outer vehicle seat, you can take the inner SIP bumper off in order to be able to fit several seats/people next to each other. When installing the seat in the middle position in the vehicle, both SIP bumpers can be taken off if you would like to place other seats/people next to the it on both sides. When installing this seat in the middle position in the vehicle but are only placing another seat/person next to it on one side, we recommend you to keep the other SIP bumper on the seat.