Light as a feather, but has firm protection all around. Attached securely to seatbelt (I gave it a few hard pulls to make sure). Love that it has clip for harness in booster seat, but the clip is kind of small. Also, there is no pillow inside, but that's okay. I probably would have had to pay $10.00 more for one (as I have seen similar seats with pillows advertised at that price difference). Oh yeah, my pup loves it!