the rear seats still fold down flat. There is extra bulk, but it doesnt make a big difference, in my case. I really like that the back of the back seats are fully covered with the waterproof material, so when you have the seat down, it is protected. I have 2 dogs that shed a lot, and it seems the hair is easier to get out. It sits on top of the material rather than getting imbedded. They do seem a little warmer than the standard material. I guess that is the nature of the neoprene. I dont notice it after having the AC running for a few minutes. It is hot here, over 100 for like 45 days this summer!! I had neoprene seat covers in my old Xterra and they were way too hot, maybe because they were black and held the heat in better.