Now your partner can also be protected with the NUMBER ONE selling Dog Vest on the market today! The K-9-One is a LEVEL 2 vest stops the rounds most frequently found on the streets today. This vest is manufactured with the highest quality ballistic material and comes in a removable nylon outer carrier and International Armor is the only company with the specially designed built in Air-Circulation system. This lightweight three-piece vest has adjustable Velcro ' elastic straps, which allow it to fit nearly every dog, from a Lab to a Shepherd. Believe it or not, this vest has been wear tested by K-9's and the officer/handlers detect no hindrance in performing duties and it is preferred over bulkier less protective, Level 2A vests. One Size fits all.