I think I bought it on Rakuten for around 4000 yen. There were reviews saying it was a little small for a Sienta but still good, but I decided to get rid of it because the fit was a little off. I think it would fit a kei car perfectly. I used it with a kindergartner, and they never made any messes with food or anything. It's been washed. Car Seat Cover Rear Seat Cover 送料無料 【137cm x 101.7cm】 Drive Seat Car Seat Easy to Install Rain Outdoor Urine Stain Prevention Water Wash New Car Car Seat Protection Mat Kei Car Car seat cover with waterproof and stain-resistant functions, size 137cm x 101.7cm, available in 3 colors: black, gray, and beige. - Size: 137cm x 101.7cm - Colors: Black, Gray, Beige - Material: Waterproof, Stain-resistant Thank you for looking.