The X-BACK ONE Harness is a harness designed to meet the requirements of dogs that practice a very intense sporting activity with their owner. New : the harness has two new adjustment systems, on the front on the chest and on the back, allowing the length of these parts to be adjusted according to the dog's morphology. The X-BACK ONE Harness is ultra light and is designed to make maximum use of the pulling power offered by your dog, while at the same time protecting him from the demands of these sporting activities. The harness is suitable for the majority of dogs: Nordic, shepherds, hunters, bouviers, retrievers etc. except for those with an overdeveloped rib cage and a thin body (Dobermann, Weimar pointer, sighthounds, dane, boxers...). In case your harness is not suitable, I-Dog offers you a customisation service for your X-BACK ONE harness (https://www.i-dog.eu/fr/entretien).