What's New in Version 2? Version 2 retains the same signature Choke-free X-Frame Design. On top of that, here's what we improved. Thicker Soft Mesh - extra layer of breathable mesh for extra padding and comfort. 2-Tone Color - vibrant and unique colors that pop. Quick Release Buckle - easier on your fingers and requires less effort to open. Why Comfort X? Did you know that small dogs are more prone to neck injuries from regular collars due to their smaller physique and neck structure? This is especially true if your little furry member is a strong puller. You see, while a yank to the dog leash might do just a little to bigger dogs, it can lead to severe neck injuries like tracheal collapses, a chronic and progressive disease that involves to obstructed airway and crushed windpipe. YES, it is that serious. Why Comfort X Head-In? Head-In harness, also known as over-the-head harness, has been the standard and classic design in the harness industry. It is very difficult for your pooch to get out of a head-in harness because its neck enclosure is connected to its chest enclosure. However, it does take more time to put it on your dog and requires your dog's precise neck measurement compare to a step-in harness. If your dog is calm and isn't fearful of having a harness over their head, the Comfort X Head-In Harness V2 is a great choice.