M-PETS Secura Safety Car Harness. M-Pets Secura Harness protects your dog in the car and thanks to the reflective flashes, your dog will also be more visible during evening walks. The Secura Harness adapts from travel harness to a walking harness with ease. Compatible with any vehicle seat belt system Reflective flashes for low-light walks 2in1 harness is comfortable enough to use as an every day harness Available Sizes (Measurements are Approximate): X-Small Chest: 29-41 cm Girth: 16-43 cm Small Chest: 44-52 cm Girth: 16-59 cm Medium Chest: 48-66 cm Girth: 28-98 cm Large Chest: 52-78 cm Girth: 28-104 cm