It covers the hole above the sub transmission and blocks that heat also. It also helps with steam when you hit water that comes up between the seat. It is all one piece no seems. This material is made as a reflective heat barrier. All the slots for seat belts ect. Would be cut all you have do is slap it on and go. The extra that sticks up in the back you tuck it behind the seat after its in place which makes it doubled up behind the seat. So if your interested make a comment. I will sell them for 25.00 shipped. Plus $1 paypal fee Thanks.