FidoRido-Harness. This harness is specially designed to work with the FidoRido Pet Car Seat (sold separately). Each harness has two anchor rings as well as a ring for your pets leash. This package contains one adjustable harness. Comes in sizes between S and L. Each sold separately. Measurements: S- 8 inches to 16 inches; M- 16 inches to 24 inches; L- 24 inches to 30 inches. For best fit, measure the width of your pets chest. Made in USA.