Pesp Dog Pet Adjustable Safety Seat Belt Restraint Vehicle Car Vest Harness S M L Pet can sit, lay or stand freely yet safely in car. Broad padded chest plate for extra protection and comfort. Any seat belt can go through the harness backfunctions as an auto or walking harness. Vest Harness can be used as a car restraint, non-choking harness and chest protector all rolled into one easy to use device. Size:#S Neck:35cm-45cm/13.77-17.71" Chest:40cm-50cm/15.74-19.68" #M Neck:40cm-50cm/15.74-19.68" Chest:50cm-60cm/19.68-23.62" # L Neck:50cm-72cm/19.68-28.34" Chest:60cm-80cm/23.62-31.49