When developing its Y-harnesses, Julius-K9 integrated Duo-Flex elastic elements at multiple points of the Longwalk harness to address one of the major issues with Y-harnesses: the potential to put pressure on the dog’s neck line.
For example, the JK9 Speed Y-harness does not feature the Duo-Flex system’s breathing-friendly protection. This is why selecting the right size and adjusting the harness correctly is especially important to ensure neck comfort.

Julius-K9® — Power harness design for free breathing and free throat