Ergonomic - The Y-shaped neck allows free shoulder movement and minimum breathing constraints. By having the pull force come from the sides the weight is evenly distributed over the entire harness. Padded neck opening for stability and support. Developed by professionals - This dog harness is developed, tested, and used by world-leading athletes within dog powered sports such as canicross, bikejoring and skijoring, but applies to any active dog. Adjustable - This dog pulling harness is highly adjustable to fit most dogs. Both chest and length can be adapted to your dog's body shape for optimum performance.