The Tru-Fit dog harness is designed to work as both a walking harness and a car safety dog harness, for added security when you and your dog are on the road. Five adjustable points for custom fit. For more control walking a strong pulling dog, attach leash to back. For car use, a tether and carabiner clips to the back of harness and wraps around the seat belt creating a safe environment while travelling in the car with your dog. All steel hardware with a padded chest plate. 210-denier 100% polyester; 100% nylon webbing. Sizes S (16\\\" - 22\\\" chest, dogs 10-25 lbs, M (18\\\" - 28\\\" chest, dogs 25-50 lbs, L (24\\\" - 34\\\" chest, dogs 50-80 lbs, XL (28\\\" - 44\\\" chest, dogs 80-110 lbs.