Here's the deal. My Sienna has a large plastic base for the front seats. This lid is not big enough to wrap around the base. So I improvised by putting a cover between the chair and the base. It was a long and awkward process because it fits snugly on my fingers and I think if I used anything else I would risk poking it through the fabric. I also needed one without side panels (we use armrests!) and while this one fits the bill, I wish it had at least one more strap around the back. It attaches at the bottom, which isn't a big deal as it comes with a nice rubber hose that slips between the seat and backrest to keep it in place. The upper (think of a sandal sock that only covers the toes and ball of the foot) keeps riding up (reverse gravity?) so I have to keep tugging it back into place. Would straps connecting the upper back to the lower back help, or a strap around the middle of the back? I've tried different covers and this one is by far the best, but it's far from perfect.
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